Mike...
On mine 70mph=2000rpm. This was on flat level freeway. My Inst Econ was reading 11mpg at this speed probably due to h2's boxlike aerodynamics and the added rolling resistance of that big of a tire. I do know one thing though, fuel economy drops noticebly after about 62 or 63mph on my H2. I guess one might try a trip without using overdrive to kind of get a feel if higher numerically gears might be a step in the right direction at freeway speeds.
Don
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