If you want a H2 and you want to get better gas mileage, switch out the front and rear ends for 3.73s instead of the 4.10s.
Aside from that, very few things are going to impact the gas mileage enough to pay for themselves.
The Denali and the Escalade both run the same engine as the H2 and weigh nearly the same but both get better gas mileage as their gearing is higher. They also aren't worth crap off road.
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