will TOD disconnect improve MPG?

[PeteVX]

will installing a TOD disconnect switch improve MPG, currently i'm getting about 12 to 13 MPG which isnt too good, figuring normal driving is a 80/20 rear to front split, removing the 20% drive to the front wheels should theoretically improve MPG, right?

Anyone have any experience of this?

Pete

[SPAZZ]

Tod Disconnect, Aisin manual hubs, and install a locker in the rear so it will be open(untill the locker is turned on for offroading) instead of limited like stock...and yes you get better gas mileage. I'm open in the rear azle and I get a little better mileage. But then again I have 456 gears.

[newthings]

Mine did not.
The milage variation with TOD disconnected and free unlocked hubs, was within the normal milage range I experienced.
I regard this configuration as a way to drive home with a broken C-V joint using 2 wheel drive.
Roy

[Nazrat]

I've had my hubs unlocked and TOD off for 2 weeks now. The past two tanks have been 1mpg higher than the weeks right before that.

-Tad

[Maugan_VX]

it would probably help you more to just moderate your driving style, and keep the vehicle in tune.

[VehiGAZ]

Yeah, there's too much 4WD running gear that needs to be turned even when in 2WD to make much of a difference in mileage. 12-13 mpg seems very low, though. Go for a tune-up, and try some injector cleaner, too.

[moon buggy]

Just as another measure for you, with my JDM model [3.2L sitting in 2High - rwd] for the tank according to my Japanese owners book, I can get 85L of fuel in and the fuel light comes on at 8L left, I refilled mine when the light came put 76L and travelled for 530KMs, mix of short round town plus some 25-50km highway runs, not revved over 4k, Power button on when i remembered..so according to my fuel calculator..that's ~ 20mpg, the premium fuel I use is 95 octane, the best available here is 98 octane ....but is like another 6 - 8 cents a litre more, taking that fuel to nearly $1.20 AUD per litre !!, so I just opt for 'regular' premium..

..also my VX even with 20s at 275/45 are supposed to only give a speedo error of 1 - 2% tops, but its actually around 5% [used GPS plus 2 other cars to compare speed to indicated, speedo shows more speed than actual road speed], ....the speedo error was even worse with the original 16s close to 10%...anyway ...based on speedo error..around 19mpg..

[SGT.BATGUANO]

530 km = 329 mi

85 L =22.5 gal

76L = 20gal

So you're getting 14.5 or 16.5 mpg before tire correction

[moon buggy]

Oh well, I was pleased to get 530ks with the light going on...and in view of fuel efficiency [lack] ..I am glad Isuzu fitted the capacity fuel tank [larger] that they did to give a half decent touring range.

...hmm..I'll recheck my numbers again, my fuel calculator is a bit old [slide rule type]...but doing the simple divisions on the above 76L/530kms = 14.3L/100kms which is [on reflection] up there with the bigger 6 cylinder 4wds, in our market [Prado/Harrier/Montero]...

Will fuel/oil ever get back to under $50US a barrel..$66 today !!

[PeteVX]

Sounds like its not worth the effort then, thanks for the input though, i didi put fuel system cleaner through there a couple of months ago but it didnt make any difference, i replaced the pcv valve too and have a K and N filter on it, i dont drive it too hard but have had the AC on pretty much all the time for the last few months...gets pretty humid here in Minnesota!

Ohhh well, like i bought the car for its fuel economy right? hah hah!