Best changes to increase MPG [Archive] - Hummer H2 Forum: H2 forums

Best changes to increase MPG

05-29-2004, 09:07 PM
I am a new H2 owner and wondering what you all think is the best aftermarket items to add to my Hummer to increase the performance and MPG (mainly this). I don't want to void the warranty. Thanks

05-31-2004, 05:37 PM
install a magnuson supercharger. I am getting around 2 mpg better in all conditions since having mine installed. I also had a full corsa exhaust installed. The supercharger comes with a 3/36000 mile full power trane warranty.