Some stats' on VX mileage

[Ldub]

Cyrk,

Couldn't agree more...the loudpedal sucks petrol bigtime w/ s/c.

However, on a calm day on flat ground, (believe me, we have plenty round these here parts) I can sometimes squeeze 19-20 out of her w/ cc set about 70-75.

My $.02, Ldub

[migil]

I've had my VX since '01 and I've been consistently getting about 330 miles per tank using 87 octane gas. It normally takes a little over 300 miles before the gas light comes on steadily. 63K miles and still running strong.

My city/highway driving ratio have varied over these years. I'm convinced that being in Florida (A/C on most of year, no hills whatsoever around here), some minor upgrades (K&N stock filter, synthetic oil all around) and an average driving style have contributed to the acceptable (by VX standards) gas mileage I'm enjoying.

[morgan-tec]

One thing to keep in mind is that mpg will be effected by the elevation you live at, this is commonly forgotten. My Axiom has an onboard info center that tells me i get 17.5 avg mpg with a very heavy foot and my 22s. I did notice a solid 1.5-2 avg mpg increase with my intake kit, and another .5-1mpg with my exhaust. Even with the way i drive which is very agressivly i still get decent milage. Remember that my Axiom is quite a bit heavier than the VX but has the ecact same drive train. The biggest factors to good mpg are clean air filter, regular oil changes with quality stuff, and good gas. I have found the last one to be a big factor in my area, if you get the cheapest gas you can find from the "U pump it"you will get a noticable amount less mpg than with a quality gas such as Shell or Texaco.

[Ron Pfeiffer]

I noticed that I get about 290 miles to the tank (310 corrected for Nittos) in the winter, but can squeeze 310 (332) out in the summer. I live in northern VA, so the differences are noticable, but certainly not what I would call extreme.

Colder, denser air = more oxygen content per given volumer = more aggresive combustion?

My Yakima rack with full-sized spare costs me about 20 miles per tank. Interestingly enough, my rack WITHOUT the tire has the same penalty.

Ron

[engfant]

I maybe able to add to this. I am a former owner of a VX (and will be again in the near future as $550/month wasn't doing it for me )

I now drive an 81 Olds Cutlas with 30K original miles (bought it with 17k)

NOW, over the past 18months I've also noticed that I am getting like 15MPG and this is after 3 tune ups.

I decided to do a little investigating. Has anyone ever thought that the gas stations are WATERING DOWN THEIR GAS???!?!?!?!?!?!

I can ONLY drive my car on 93 octane and anything lower causes EXTREME ENGINE PING. This has only started to happen and is MUCH MORE NOTICEABLE in a carborated engine.

I asked the dude over at the local Valvoline and he didn't DENY this is happening, just isn't in a position to start pointing fingers.

(ps. STOP HATING ON THAT VX. There are plenty of us out there that would LOVE to be back in theirs )

[volume311]

Colder, denser air = more oxygen content per given volumer = more aggresive combustion?

Ron

Colder air is denser so yea better for combustion but because it is denser it is worse for aerodynamics. The tradeoff isn't the eaull so I don't know which one wins.

[xdfarrx]

I get 300-375 depending on driving style-

[Bulldoggie]

I decided to do a little investigating. Has anyone ever thought that the gas stations are WATERING DOWN THEIR GAS???!?!?!?!?!?!

I don't know about water, but they have been busted before for altering the electronic in the meters and I think they are doing it again! Three times I've gotten reciepts for more than the capacity of the tank and I didn't push it in.

[SPAZZ]

I purchased my VX in SanDiego April of 2001 where I was stationed in the MArine Corps from Sep 1995 to Oct 2003. Right after I purchased it I drove it 55mph for the break in period and then was kind of easy on it and accelerated slowly and went only 65 - 70 mph max till I reached a few thousand miles then I decided to drive aggresively. I still got 400 - 410 miles per tank. I drove it home to Colorado which is like 1,000 miles one way, drove another 1,000 miles while there over a month period and then drove it the 1,000 miles back to base.

California puts that detergent in your gas that burns cleaner emissions, but gums up your fuel system. So, the further away I got from Cali the detergent was worked out of the system with the nontainted gas. Also, in high altitudes I was able to use the available 85 octane gas and my mileage was boosted to almost 20mpg. I never was able to get better mileage than with the 95 Octane fuel even though I was driving up and down through the mountains. As soon as I got back to Cali and that crappy detergent gas started to gum things up my mileage would drop drastically to 15mpg. once I passed 12,000 miles on the Odometer it was all downhill from there. till rockbottom at 200miles per tank.

So, I was able to drive in Colorado's high elevation 400 Miles per tank and then go to driving SanDiego's sea level elevation at 200 MPT. That is all on a stock VX. That was when I started to mod for better performance. A unibody lexus weighs more than the VX and gets better mileage, how??? The Trooper gets better mileage and weighs more than the VX...is it the true 3.5 engine with 3.5 heads and not the VX's 3.2 engine with 3.5 ported heads even though the light weight???

Our VX should have a V8 and get the performance for the mileage that it gets and not poor mileage from a 4,000 pound vehicle with a V6. The Monteros have less horsepower and torque than the VX, weigh more, and they perform just as good on road(offroad the VX blows it away) how do you figure??? teh VX is the poorest financial investment in terms of automobiles, but the best mental personal investment in terms of offroad for me. maybe a Hemi would just about do it in the VX...get the horsepower for the mileage. I bet it would just about be the same off road and better on the highway for mileage.

[mbeach]

The Monteros have less horsepower and torque than the VX, weigh more, and they perform just as good on road(offroad the VX blows it away) how do you figure???

I agree with the VX needing a more powerful motor, but with more and more research I'm starting to accept that more CCs is not the way to go.
I'm assuming that you're referring to the body-on-frame Monteros, which have a very similar construction to the VX, and also displace 3.5L. They also get 17mpg, regardless of city/highway -I've worked on quite a few and if I could find a '99 SR, I wouldn't be driving a VX.
It really boils down to a weak engine in a heavy truck = poor mpg.

With appropriate gearing, tires and a diet, the VX could be a competitor in the milage events, with very little work done to the engine (just basic performance mods).
The fact is, most of us add things (like big tires, big stereos, racks, etc.) that KILL our gas mileage. Someone's sig says it best:
[I]The price you pay to be different[I]

It is my personal opinion that the single worst feature of the truck is the transmission. I can just feel this thing sucking up horsepower.
I think that if someone manages the 5 speed swap, we can expect 20+ mpg all day long.

[cascabel3]

I would have given anything for a 5 speed manual tranny on the VX. The one thing I didn't like about the VX was the lack of that option. Granted, in heavy traffic an automatic is better, but although I live in LA basin I manage to avoid traffic for the most part. Like MBeach stated, the tranny is a big part of the waste.

Spazz also answered one of my long sought curiosities; when I road-tripped in my '91 Trooper I noticed that I got better mileage once out of California. When I drove through Colorado where I spent a bit of time above 8000 ft, My mileage was insane. At times I though my gauge was broken, the needle just wouldn't budge. I deduced back then that this was due to following causes:

At higher altitudes electronic ignition will lean the fuel/air mixture to compensate for thinner air, the reason Jets fly as high as they do (leaner mix, less friction and catching certain currents) and the fact that on these Colorado mountain roads my average speed was ~45MPH. Now I can add Spazz' California fuel factor and complete my theory.

[Numba1goalie]

So basically, out of all of this, there really is no cure to making our milage better?

For the most part with California residents that is?

[Ldub]

Just drive down hill,with the wind all the time. You almost never get where you wanted to go, but you get to see new places!

[VehiGAZ]

Actually, the VX's automatic tranny is not a problem like you might think, because it runs full-lockup in all but first gear, so the power loss due to an oil coupling in the drivetrain is just not there. The fact is that the VX is a very heavy vehicle (for its size), with full-time 4WD, a big frontal area, a high-drag body, and an engine that gets a lot of torque out of a gallon of gas. You're not going to make a 25 mpg gas-sipper out of that.

I've gotten as low as 13.9 mpg with my Yakima cargo box in the winter and as high as 18.2 in the summer with no box. (The box costs me about 1 mpg whatever the season) Winter air is denser, but colder, which I think is what reduces mileage in the winter on ALL vehicles.

Speed and the amount of stop-and-go is the big difference from what I can tell. I push 80 mph on the highway, and I can tell the engine needs a lot more pedal to keep the pace. When I run long distances on back roads between 45 and 65 mph, I get the best mileage (a hair over 18 mpg). It drops at least 1 mpg when I'm running on the highway at 80. On the other hand, my 20-mile drive to work at 40-50 mph on back roads with several stop signs and lights makes my mileage drop to about 16.5 or so. Same speed range, but more stopping-and-going make the difference.

Another thing I noticed on my old Prelude is that a change in tires made a big difference in the mileage. With the original tires (Bridgestone all-season sport tires) I got as much as 26 mpg highway. When I swithed to Avon three-season performance tires, it dropped to about 23.5 mpg. The mileage you get in the stock car can change with almost any mod. All the little factors play together to determine your mileage. Change any of them, and you may change your mileage.

Locale and types of gas make a huge difference, too. The gas you get in one city will not be the same formulation that you get in the next - even if it's the same grade and the same company!! In fact, the landscape of gas formulations is wildly complex, and it's a principle cause of the generally high price of gas. Refineries have to make literally dozens of different formulations of the same octane grade to supply each and every county with the type of gas they think will be best for their environment. Car & Driver did a great article on this a few yeas ago. It's a ridiculous situation, really.

If you want cheaper gas, tell your state congressman to reduce the number of formulations that localities have to pick from.

Ok, time to get off the soap box and get to work...

[Numba1goalie]

Awesome information.

So basically all we can do is fold our arms and like it!