65 mph seems to be the best mpg area for the H3 on the highway. I've done lots of highway now, with over 6,000 miles and running on Mobil One Synthetic in the crankcase, and I get around 18 highway, pushing it up to 75-77 mph for long periods, seems to down the mpg considerably, to about 16.5 mpg. 18.7 mpg is still my best tankful and that was in Kansas with a strong tailwind from the West, and 12.5 mpg is the worst, when it was new, in Dillon, CO, off-road with hours spent in low range and speeds never over 15 mph. I think it has a lot to do with the frontal and induced air drag the body has at highway speeds. I also tried three tanks of premium and found no difference at all in the mpg or performance.
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