Well, my H2 is in the shop and they gave me a loaner 07 H3 with 23 miles on it. The H2 w/ 37's got like 10-12 MPG no matter what I seemed to do. I have put about 320 miles on the H3 and it just needed its 2nd fill up ( I presume). So it gets about 16 MPG.
I like the little H3 but, it was tough to fit all of my gear and buddies into it for a trip out to our farm. We had to leave the dogs at home
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I like the 07 H3 better than the 06 that they loaned me before. With a roof rack, adv., Alpha, it could almost work for me....but the towing is still a bit light. I wish they made a H2.5.