I picked up between 2 and 3 highway MPG's on our old RV when I installed Michelin 215/78-16 LTX Highway tread tires in place of the old all-seasons. This might look a bit strange on an H2 though.

At the very least, remove the roof racks whenever you don't need them and plan on doing a lot of highway miles.

 

i try all the time. since i drive by myself usually (and i make a 60mile round trip highway trip a few times a week), i stripped the middle row bench seats out (saved me almost 100lbs), then i took off the spare tire and its carrier off the back (two person job at least), took off my tube steps and roof racks. . and in the end, saved myself almost 500lbs (1/4 ton, the h2 weighs 3tons.) then, mileage went from 12or 13 up to 13or 14. . . idk.

i had really worn stock tires on it, and i could get 18mpg highway, but i got brand new ones and highway dropped to 15. so, i say the best would be get street all weather tires, and take the stock bf goodrich a/t's off. that would be the best

 

get a prius!!!! LMAO

 

i was wondering if any of you guys are using the predator raptorq. and if so what do you think of it? i got the jet chip but i'm not really impressed!

 

From my other post:

Things you can do to improve your milage: (all this is not necessary but this is just a list of things you can do)

1. remove weight, such as spare tire
2. properly inflate tires or inflate a little more than recommended but never over the maximum psi
3. k&n air intake or airaid air filter / intake systems
5. performance exhaust systems
6. hypermile (look it up): shift into neutral when going downhill or coming to a stop or into traffic, it actually makes for an interesting and fun different perspective on driving. After a while you can perfect your hypermiling by shifting into neutral when coasting, going downhill, etc and often times not even having to hit your brakes at all when in traffic
7. mobile 1 fully synthetic eco oil promoted to increase gas milage
8. reduce drag, keep your windows up, off road lights on the roof and roof racks can decrease gas milage by 10% based on a car magazine article
9. anything that takes power will use power and thus put more drag on your engine to charge the batteries for power, thus reducing gas milage for that time period. If your headlights are on or your wipers are on, defroster, air conditioning: anything like this that uses power will reduce your gas milage for that period of time while your using it.
10. performance programmers.
11. drive at the lowest possible rpm
12. ovbiously regulate your right foot
13. install electric fans (minimal gain)
14. a 6 speed transmission will get better gas milage than a 4 speed in the exact same application
15. use low rolling resistance tires (not sure if this is even possible for an h2) or very well worn low tread tires would achieve better gas milage than brand new tires
16. Switching to HID headlights or LED headlights use alot less power and thus would increase gas milage a little bit vs the old setup


Also a supercharger in this application will significantly reduce mpg.

 

Hey pTeam,

Ive heard 'hypermilin" can damage the tranny pretty quickly (I only did it on rentals
But Im no expert, can you give some more info on this?

Thanks!

"6. hypermile (look it up): shift into neutral when going downhill or coming to a stop or into traffic, it actually makes for an interesting and fun different perspective on driving. After a while you can perfect your hypermiling by shifting into neutral when coasting, going downhill, etc and often times not even having to hit your brakes at all when in traffic"

 

Well I've been doing it for years without problems. I'm sure it could damage the tranny, especially if you do something wrong, but alot of things can. Personally I feel when coming to a stop in 4th or 5th gear its easier to shift it to neutral instead of having it downshift 4 different times.

 

1. Manual tranny makes hypermiling a snap. Unfortunately, it's not real practical to upgrade to a manual.
2. Get a ScanGauge and keep an eye on instantaneous MPG. You'll quickly learn some very effective techniques.
3. drive like there's an egg on the accelerator pedal. Your kids will give you sh*t for driving like grampa, but it works.
4. garage it during the winter (kind of silly, since snow is probably one one of the reasons many bought a Hummer). My H3 averages around 16 mpg in the winter, 18+ in the summer. I don't know if it's the winter gas, the temperature, or something else, but it's been pretty consistent in the two years I've had it.

 

you can put in diff-rent gears like 3/72s will not off road real well but your mileage will go up i get 20mpg in my h3 at 70mph with roof rack on.