It’s 2024 now and there are technologies and solutions to improve fuel economy. What you said is old school and outdated. Even if our tax pays for fuel tank, it’s H1 not H2. H2’s definition should be comfort and offroad capabilities

 

Haha, you talk like you own one and have burned some tummy too. Congratulations.

 

Yes the new technologies are great like DI, DoD, VVT, etc. I save $1500 in fuel over 150,000 miles then I have to spend $2000+ fixing those things (massive carbon buildup on DI, collapsed lifters on DoD, failed VVT actuators, etc) since none of those features seem capable of lasting as long as the engine itself.

 

You are spot on with this.
Of course there a few that got some good mileage out the gallon with some modifications that are on the market.
But k owing that other parts wear out or fail more often because of that it ain’t worth it.
Just for the few that will analyze the whole engine inside out.
For my Chevy Diesel it wasn’t hard to do this and I’m driving 70k miles a year.
I got a 99 Ford F250 Diesel and it has 1mil+ miles on it and still the same transmission and most of the engine.
The OP sees this as an accomplishment to have his H2 on a better gas milage.

 

Lose Weight!

In fact, according to the Environmental Protection Agency (EPA), for every 100 pounds taken out/off a vehicle, fuel economy increases by 1 to 2 percent.

 

Removing the seats, dashboard, take off the roof, ridding of the bumpers, changing the wheels for carbon spares, don’t forget the heavy doors.
If you seen The Martian you’ll understand how that works as they send a man in space under a tarp 😂

 

I don't need(approx weight):

• spare/mount bracket/jack kit>>>> -200lbs (RSA included with my insurance policy)
• rear seats/mounts>>> -200lbs (easy to reinstall if needed)
• side bar steps with brackets >>>-50lbs (brackets are junk & sent to the curbside pickup)
• front splash & skid plate shields>>> -50lbs (more airflow to the drivetrain)
• I lost body weight since purchase 12yrs ago >>>-80lbs (260 to 180)

Still all OEM (NO bells and whistles) and a huge improvement 0-60 & MPG, with less weight.

 

outdated is the hummer. if you want new technology then get a fuel efficient 2024 vehicle 4 banger gdi turbo. or a prius. drive that and enjoy the hummer when you feel spendy. the hummer is what it is. a chicken will never be a swan no matter how you ruffle it's feathers.

 

The factory airbox is fantastic, an airraid tube is a good addition, Borla makes a great cat back system, I have it on mine. Bridgestone Dueler are good tires with a more street friendly tread. Premium fluids like Liqui Moly and Redline are top of the line. If you change the O2 sensors. OEM from your local GM dealer are the best, too many fakes on Amazon.

 

i have replaced the fuel filter and air filter, replaced all fluids, replaced spark plugs with oem acdelcos, all four gm oxygen sensors. cleaned the throttlebody, removed the spare tire and the third row jump seat, run the BFG TKO's at 40 psi. fether the brake and fuel. none of it drasticly improved MPG at most in city driving i get 7.4 to 8.6 if i do some highway it might go into the high 9's. and i accept thats what it is and ever will be. i beleive 2003 is the only year thay actualy gave you acess to see the onboard MPG on the cluster. in later production HUMMER actualy removed the option cause of so many complaints of MPG.