Wow I had no clue this was possible.

[JHarris1385]

I turned 300 miles on a single tank finally. When I filled up I put about 19.402 gallons in. This is about a 100 mile upgrade from a year ago.

http://www.vehicross.info/gallery/data/500/VX_300_mile_Tank.JPG

[Bulldoggie]

I get a little more than 320 per tank, Highway Miles.
Quite a few more when you factor in the larger tires.
GPS puts me at about 5-6 mph faster that indicated.
Around town milage, that's another story.


City milage is about 200 miles per tank, for me.

[JHarris1385]

What is the calculations for larger tires?
I am running 265/65/16 = 31.6 tire A/T

I used not be able to pass up 220 if that. I remember the days when 79 miles was a half a tank. All becuase of fuel pressure regulator.

[Pepino]

i probably get like 200 a tank or maybe a little more, i am always speeding i spend more time going faster than 80 than under lol

[VCAMILO]

I can get about 175 around town with larger tires. :mad: Dont know about highway as I dont get on them much for full tank drives.

[johnnyapollo]

I get around 290-300 per tank and I regularly travel at 80 mph or faster (interstate) - the mileage goes down around town, but it's still in the 270-280 range, and I'm supercharged.

-- John

[ChicagoKelly]

Wow, how did you DO that? I have a stock 99 VX w 100k on it & getting roughly 10 or 11 mpg. My 10 year old Land Rover gets BETTER gas mileage if you can believe it! :eek: I

Am putting new engine in this VX now since old engine seized up. Now I'll have a VX with 0k miles on it! I hope it helps.

If anyone has ideas for one major way to better MPG from their VX, please pass em on!

T H A N K S - Kelly

[JHarris1385]

Changing my fuel pressure regulator solved it all......I reached 300 now becuase I drive more highway miles than before.
Im lifted with larger tires it can be done.

[Ascinder]

:eek::eek::eek:How much was the regulator and how hard was it to put in? This sounds exactly like my situation now, I would love an extra 80 miles a tank!!!!

[Bulldoggie]

What is the calculations for larger tires?
I am running 265/65/16 = 31.6 tire A/T

I used not be able to pass up 220 if that. I remember the days when 79 miles was a half a tank. All becuase of fuel pressure regulator.

I edited this from the only time I've commented on tires;
I also run 265/75's on 16 with no trimming, Not sure of the Dia.
Avon SXT mud terrain
Great tread, great high speed, good grip. Look good too.
they show very little wear. EVEN after putting over 45,000 miles on them!
Adds 5 mph over indicated speed
Some "soft" rock crawler compounds will not last long on the street = $$$$$
Not triing to sell anyone, but I've been extreamly happy with these tires.

[JAFO]

If anyone has ideas for one major way to better MPG from their VX, please pass em on!

Mine does measurably better with higher tire pressure. I keep mine within 10% of max. Less, starts dropping one or two miles per gallon. I average 17.5 MPG and just rolled over 100K.

Falken Ziex S/TZ-04 255/55R18 HR UTQG=460AB

[BeeVenom]

The 4.30 something gears will never get us to 30mpg, so oh well!

[MSHardeman]

I'm getting around 350 (got 370 once by letting it run down to fumes) per tank full with 285/60/18 Terra Grapplers. I've never figured out the percentage that my tires are over the stock tires so I can't tell you how many actual miles per tank that is.

[Bulldoggie]

Taller tires = higher final drive ratio.
Or, taller tires is like having an overdrive gear.

Someday, I will get Tone's speedo correction kit, for the correct speed, and correct shift points.
It shouldn't effect Highway milage, but it may help the tranny work easier.

[PHO2GR4]

I can easily get 378 miles on my trip odometer. I just fill up once, drive 189 miles, then fill up the tank again without hitting the odometer reset switch. Drive another 189 miles, and BAM!

378 miles. Sweet!

Oh, you mean 300 miles on ONE tank?!? Never mind. :bwgr:

[dietz99vcross]

15 Miles per gallon x 20 gallons = 300 miles on a tank if I wait for the low fuel light to come on. In the almost nine years I have had my VX I would say my mileage has alway been between 12 and 17 be it on the highway or in the city.

[So-CalVX]

so I'm guessing I'm not the only one getting less than 15 mpgs? I'm usually filling back up at around 220-230 miles on the trip. Practically all highway, all stop and go and without a warm up period. no engine mods, no oversize tires all stock.

[JHarris1385]

I used to feel your pain.


Ascinder - It was easy once you get past the allen bolt on the back of the chamber area. I think it was etl - erik that cut down an allen wrench to fit in that tight spot. Do a search and you will find a thread I and he has on it. The screen in my reg. was torn and I was running too rich. I would assume this is the case with most.

[JGeorge264]

For the past 4 yrs I've always gotten 320 miles before my fuel light would come on around tight corners and a fill up would be a bit over 18 gals.:rolleyes: For the past month or so I've suddenly dropped to light coming on solid at 275 miles and fill up is 20 gals..:eek: At first I thought maybe it was due to the winter fuel, 10% ethanol, but I never had that issue in past winters. I haven't really had any of the signs of the fpr going bad other than an occasional rpm surge or decline. I did notice the other morning when I went out to warm it up that the exhaust is pretty dark. Sooo,, I'm appealing to the brilliant minds of the vxinfo as to whether ya'll think the fpr could be my source of drastic fuel consumption?
thanks for all the help in the past, current, and future... It's well worth the $20.00.
Jody

[johnnyapollo]

Hey Jody,

Funny, the same thing has happened to me recently - the light would come on between 17 and 18 miles. Now it's coming on at 20 so I've had to adjust and make sure I get to a station quicker. I just rolled over 100k. Fuel consumption hasn't changed.

-- John

[WormGod]

11mpg/220 a tank avg
S/C with 93octane
285/60 tires

But it only gets about 3k miles a year on the odo. And since it sits in the garage much of the time, who knows how much of the gas actually stagnates and evaporates. I am sure it would get better mpg were it used daily. Considering I only have to gas it up maybe once every few weeks, you wont see me complaining, heh.

[tom4bren]

{put on dweeb hat}

Not sure if JHARRIS got a straight answer to his question about how tire diameter affects speedo/odo readings.

C=circumference
d=diameter
pi=3.141598

C=d*pi

All you really need to know is that circumference is directly proportional to the diameter and that your speedometer and odometer sensors are just reading tire rotation related to some point in your tranny. Sooo ... if your tire diameter increases by 10% both your speedometer and odometer will read 10% less than actual (your speedo reads 80mph, you're actually going 88mph and your odo reads you went 300 miles, you actually went 330 miles). I'm running 33x12.50s and TomTom tells me that I'm exactly 10% off on my readings.

{take off dweeb hat}

[Bulldoggie]

For the past 4 yrs I've always gotten 320 miles before my fuel light would come on around tight corners and a fill up would be a bit over 18 gals.:rolleyes: For the past month or so I've suddenly dropped to light coming on solid at 275 miles and fill up is 20 gals..:eek: At first I thought maybe it was due to the winter fuel, 10% ethanol, but I never had that issue in past winters. I haven't really had any of the signs of the fpr going bad other than an occasional rpm surge or decline. I did notice the other morning when I went out to warm it up that the exhaust is pretty dark. Sooo,, I'm appealing to the brilliant minds of the vxinfo as to whether ya'll think the fpr could be my source of drastic fuel consumption?
thanks for all the help in the past, current, and future... It's well worth the $20.00.
Jody


Dark smoke = rich mixture and or oil
Don't be scared, but you may want a mechanic to look at your spark plugs and check the color.
Cheap spark plugs will burn off their center eletrode, making too large of a gap.

[JHarris1385]

True however if the liquid did not fowl the plugs they are rated for 100k. Too rich = new fpr.

[JHarris1385]

Update new week.....

I did a bit of mud/snow slinging this past week so I assume that is the 20 mile difference.

http://www.vehicross.info/gallery/data/500/VX_280_mile_Tank.JPG

[DarkWing]

My usual is to drive at least three days to/from work before looking to fill up. (Work is ~~47 miles one way.) Last week I tried it a fourth day, the "gas light" came on before I got to the staion, and I got a little worried, but I made it. I got about 370 miles, put in 20.7gallons. (I fill up the neck. I won' stop filling until there is gas to the cap.) Still stinky mileage, but you do have range.

By the way, I'm all stock. Didn't run the air beyond defrost.

LOVE THE "V".

D.W.
#0147

[Ldub]

My usual is to drive at least three days to/from work before looking to fill up. (Work is ~~47 miles one way.) Last week I tried it a fourth day, the "gas light" came on before I got to the staion, and I got a little worried, but I made it. I got about 370 miles, put in 20.7gallons. (I fill up the neck. I won' stop filling until there is gas to the cap.) Still stinky mileage, but you do have range.

By the way, I'm all stock. Didn't run the air beyond defrost.

LOVE THE "V".

D.W.
#0147

Just a FYI about overfilling up to the neck...
It's possible to damage the EVAP cannister/ system by doing so... a little searching will provide more info to back this up.:_wrench:

[Ldub]

Here's what I was talking about...

http://www.vehicross.info/forums/showthread.php?t=9592&highlight=EVAP

[Bulldoggie]

Here's what I was talking about...

http://www.vehicross.info/forums/showthread.php?t=9592&highlight=EVAP

What He Said.
The fuel vent need air to work.

[Pepino]

i just drove yesterday to chicago after filing up my tank and i noticed that the light came on when i only drove for 130 miles! what can i do to make this mpg better! imagine 130 per tank! what am i doing wrong i do drive really fast but still thats using a lot of gas!

[Ldub]

i just drove yesterday to chicago after filing up my tank and i noticed that the light came on when i only drove for 130 miles! what can i do to make this mpg better! imagine 130 per tank! what am i doing wrong i do drive really fast but still thats using a lot of gas!

:rolleyesg Uhhhhhh...maybe, slow down ? :rolleyesg

[Pepino]

my life goes by your quote lol
"FASTER,FASTER,FASTER...Until the thrill of speed overcomes the fear of death!"

[JHarris1385]

Pep - change your Fuel Pressure Regulator. I used to get around the same out of my tank.

[Pepino]

Pep - change your Fuel Pressure Regulator. I used to get around the same out of my tank.

which is a good Fuel pressure Regulator cause i looked on the intrnet and i found from 20 dollars to 150 dollars what should i get? and does it help the gas mileage or what is it that it does?

[JHarris1385]

Do a search here its $70 There should not be any ranges. You might be lookin at fuel pump.

[CoastieCosta567]

i get 350-370 mpg as well, i and i have 132,000 miles on mine, it's all in air pressure and changing new small parts as well. well i think it is.

[Jolly Roger VX'er]

mine varies with the seasons....I got 16mpg the last fill-up which is typical for winter for me. The worst I got this winter was 15mpg but that involved a few times of just idling in the drive-way for 20 minutes each time because she set for a couple weeks. Typically in the warmer months (spring,summer,fall) she gets 17 to 17.5mpg mixed driving and SC'ed.

My all time best was traveling to Vermont with cruise on she got 23mpg there and 22mpg back. I've never come close since.....drats!

[cyronman]

I filled up just about COMPLETELY (~21 G's) on Monday--drove up to Riverside, over to Irvine and back, then back to San Diego.
Burned close to 3/4 of the tank, and had to fill up again today, but...
I had rolled 354 miles.
Not sure what the exact difference is either from the stock size wheels (not drastic), but around town I usually get 290 miles a tank.

[nfpgasmask]

I just tested my VX. Filled up, reset mileage, and I got 357 miles on one tank. I probably could have gone another few miles as well, the light was not on yet.

Bart

[CrnCnn]

That’s nuts. I probly could get closer to 250 then I am now but my gas gauge is messed up so I get nervous when its close to empty.

[Bulldoggie]

Everyone's favorite show, "Top Gear" Dyno'ed his Shelby Mustang, "Bullet" edition @ 250 HP
I think our 215 HP and 16 MPG VX's are in range.

[Ldub]

Everyone's favorite show, "Top Gear" Dyno'ed his Shelby Mustang, "Bullet" edition @ 250 HP
I think our 215 HP and 16 MPG VX's are in range.

The "dyno'd HP" on the Mustang is measured @ the rear wheels...

The 215 stock HP of the VX is measured at the crank.:_wrench:

[Bulldoggie]

Sorry, maybe Cyrk, or ?, has the rear wheel Dyno #

I'm just saying, for the amount of HP, you sacrifice fuel, no matter what you drive.

[Ldub]

Sorry, maybe Cyrk, or ?, has the rear wheel Dyno #

I'm just saying, for the amount of HP, you sacrifice fuel, no matter what you drive.

From what I've seen (previously posted dyno charts), with the s/c & 5 lb. (boost) pulley, just a shade over 200 hp @ the wheels (tires).:_wrench:
IMO, totally worth it.:naughty:

Sorry for the thread jack JH.:smilewink

[don moore]

how far down does the fuel gauge have to go to get the fuel light to come on???
Ive never seen it come on yet..

[nfpgasmask]

how far down does the fuel gauge have to go to get the fuel light to come on???
Ive never seen it come on yet..

I've wondered the same thing. I have never seen mine come on either. And that said, about 5 months after I bought my VX, I ran the gas down REALLY far. Like, below that last marker line, and the light STILL did not come on. But what did come on, was my check engine light. Not only that, my VX was running REALLY BAD. I was scared to death there was something majorly wrong. This was before I had a scan guage, so I do not know what code it was throwing. Anyway, I limped it home from the store parking lot where it started running rough and the CEL came on. After that, I changed the spark plugs with no change. I then took it to the closest gas station, filled up with a full tank of premium and used some of that tank additive that removes moisture from the gas tank. The CEL went off immediately and my VX never chugged like that again. Since then, I never let the tank indicator get below the last line. My feeling is that I got down to the last couple of gallons in the tank and started to suck up water or something. This caused the CEL and the rough running. I don't know why the low gas light never came on.

Bart

[JHarris1385]

If you think you have water in your tank. The next time it is low just unbolt the drain hole and let a little out.

[nfpgasmask]

If you think you have water in your tank. The next time it is low just unbolt the drain hole and let a little out.

Yeah, I just used a jug of that HEET stuff....

Bart

[JHarris1385]

UPDATE:

This is with conventional gas and 4 oz of Acetone. Obvious improvements but not enough. I would like to see in the 360s or so. But my tank and computer still need seasoning so I think by the 5th tank I will have my best output yet. I am currently on my fourth tank. This 345 is with some of the worse traffic yet calculated in it. It is Derby week around here for those of you that are familiar with the best 2 minutes in sports and this week = horrible traffic. I was in bumper to bumper for over an hour two days this week.

This came from 20.06 gallons of gas. =17.25 quite and improvement over my almost 10 mpg a year ago.

http://www.vehicross.info/gallery/data/500/345_gas.JPG

[blacksambo]

You guys really need to try Lucas Gas treatment. My wife and I almost always get 370 miles on on a 20 gallon fill up. Also, beware of ethanol, it will spoil your mileage. Honda does not recomend ethanol for any of its vehickes sold in New York State. Exxon/Mobil around here does not offer ethanol mixes so we stick with them, no matter what the cost.

[JHarris1385]

I am lifted with larger tires, that is the resoning behind some of my troubles.

[Pepino]

i only get around 260 a tank, thats 12 miles per gallon, so if i put ethanol it will help?

[JHarris1385]

Pep do you think you have excessive exhaust?

[Pepino]

maybe im not sure, how do i know whats normal and whats excessive?

[JHarris1385]

Just wondering if you are running rich, I was and had to replace my fuel pressure regulator. Do a serach and see if you can open it up and check the condition.

[VehiGAZ]

Pepino, something is waaaay wrong - your mileage should not be that bad no matter how fast you drive. I drive ~90 mph on the highway to VT and I get at least 13 mpg.

If you have an oiled air filter (like a K&N) then you should clean replace your Mass Air Flow sensor (MAF or MAS). It measures the air coming into the engine, which the ECU uses to decide how much gas to squirt into the cylinders. The FPR regulates the pressure of the fuel in the lines, which also affects how much gas goes in. If either one of those is off, so will your fuel mixture.

You can get a new or rebuilt MAF at AutoZone, or you can use CRC MAF cleaner.

[Pepino]

i thought i got average miles per tank (260) but if you think that i am that bad then i must be really bad lol
i have the normal filter the one that come stock of course i check it all the time and its perfectly clean, one time i got only 153 miles per tank thats like ifi was driving a ferrari!! but then i changed fuel filter and it went up to 260 and its been around there all the time!
what can i do! where can i find a fuel pressure regulator? how much are they? i know nothing about car mechanics i am 19 and have no idea about anything of this stuff, back in mexico i never had to change oil or fix anything as soon as there was something wrong my dad sent the cars to get fixed so your help is appreciated

[VehiGAZ]

Sorry to alarm you Pepino - I thought you were getting 150 miles per tank regularly. 260 miles per tank is about right if you drive hard on oxygenated (10% ethanol) gas like I do.

If you don't know your way around an engine, then changing the FPR is no place to start learning. Any mechanic should be able to take care of it for you - an hour's labor to install it plus the part, which you could get at an Isuzu dealer, online, or from an AutoZone or other parts store. It may help, it may not.

[JHarris1385]

Do a search on here about the fuel pressure regulator.

I disagree - It is a very SIMPLE instal. The hardest part of the install is getting an allen wrench to turn the rear bolt (honestly).

It is about $70 bucks and if you can get the allen bolt off it takes no more than 20 minutes. I did this install and I am no mechanic.

I jumped from about 10 mpg to about 14-15 with just that. I am now running 17.5 average - and dont forget I am lifted with bigger tires.

[JHarris1385]

Here is my thread on it:

http://www.vehicross.info/forums/showthread.php?t=10475

[snowtrooper1966]

All I had to do was lose 5 quarts of supurfulious oil;)

http://www.vehicross.info/gallery/data/500/311.JPG

Best,

[nfpgasmask]

Man, I've done that before. I know for sure that one 340 miles tank was not an illusion. But, now with the lift and new tires, I will be happy with 250 a tank.

Bart

[JHarris1385]

Another one......


http://www.vehicross.info/gallery/data/500/349_tank.JPG

[cyronman]

350...good

250...OUCH

J, is that straight highway miles, or day to day driving?

[JHarris1385]

I drive from souther Indiana to Louisville Kentucky everyday. The commute there is about 45 minutes the commute home is about an hour and 15. Highway miles to bumper traffic near the bridge that crosses the Ohio River.

Great point is I am lifted and running bigger meat (265-75-16)

[So-CalVX]

i drove to Thousand Oaks knowing i could make it on what my gas gauge told me....

http://www.vehicross.info/gallery/data/500/thumbs/301.JPG (http://www.vehicross.info/gallery/showphoto.php?photo=11583)

and then i prayed i could make it back to Ventura.... i drove the whole way back bumper to bumper, sweating, because my light came on multiple times. but i pushed through and made it to the gas station i fill up at...

http://www.vehicross.info/gallery/data/500/thumbs/320.JPG (http://www.vehicross.info/gallery/showphoto.php?photo=11584)

weird thing is... it filled up with just under 20 gallons :confused: so if i had stayed on the free way i coulda made it to Santa Barbara.... that woulda been 350 on the trip-o-meter...

got happy so i posted :grino:

[don moore]

ive never seen the light come on...hmmmmm

[Joe Isuzu]

I'm not sure I get it, I'm about as stock as can be except recently for performance muffler and green air filter. I'm not lifted, don't have oversized tires, anything. Fluids have been changed, I feel I drive smart and most of the mileage is highway. I've gotten to 300 maybe twice since I've owned it and I consider 270 good and average for me. What gives? How are you guys getting over 300 and some up to mid-300? My mileage ranges 16-17, occassionally 18 but that's it. Yea, I've got higher mileage than most (92k) but would that come into play? I'm stumped and a little aggravated to boot! Especially as gas gets more costly....

[etlsport]

yea joe i hear you.. a lot is driving style/area.. my mods are intake and muffler.. plus i have a light rack.. but other than that nothing else.. i was getting 300-350 when i first bought it.. then dropped to like 250... at one point i was averaging 12mpg living near the city.. since moving out of the city i average about 15.. just by being throttle conscious i have gotten up to 16

try replacing your fuel pressure regulator and fuel filter.. the two together will cost about a tank of gas and should be good for 1-2mpg difference even if yours arent totally shot

[circmand]

gets you further on a tank but no difference in mpg. I think we hav an 18 gallon tank but some here report pumping 20 gallons in when empty. That 2 gallons can mean an extra 30 miles and how far do you let the tank get to empty before filling can be another dozen or two miles.

[rx7tt95]

For some reason, I thought we had a 21 gallon gas tank. I remember it being the same volume as my RX7 which is 21. I know my last fill up was a hair over 20 gallons (on fumes), prior to that, it was 19.2.

[etlsport]

we have a 22.5 gallon tank.. ive filled up with as much as 21 gallons before.. topping off will actually decrease your fuel economy sometimes..

filling the neck of your gastank will get charcoal from the charcoal canister into your gas.. and its downhill from there