2009 H2 gas mileage improvement?

[sharkman]

I own a 2009 H2 and the gas mileage SUCKS! I replaced my 2006 H2 with this one under the premise that with the larger engine and 6-speed transmisson, the gas mileage would improve by .7mpg (according to the dealer). I was getting about 13-14mpg on the 06 H2. What did I have to lose: larger engine, redesigned interior, smoother ride, better gas mileage.....

What a laugh. Right now, I get 10-12 mpg, going downhill with the wind at my back. AND, the manual says I need to use Premium gasoline.

What mods has anybody installed (that are relatively inexpensive) that have improved gas mileage?