I had the predator programmer installed on my 03 H2 and my fuel mileage went from 14.5 on the highway down to 12. The motor had more git up and go but it came with too much of a price for me. The fuel was not as big of a concern as was the fly by wire gas petal. It seemed I would press down on the gas and have an inch or two of movement before the truck would blast off. I still use it for codes and may one day see if I can get a custom program to fix the gas petal.
03 H2 Yellow Adv w/ leather airraid filter flow master exhaust
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