Hughes heh237/242 in a 360?

rumblefish360 said

Truly the trick is not to waste any of the fuel and burn it all. Since we do not have a computer to control everything, compromises are made everywhere. Experiment and do the best you can.

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Yep, and the aero package at that 65 mph is a big factor since wind resistance has grown very large at those speeds compared to rolling and drivetrain resistance. Manual trannies also have an advantage over old non-locking TC slushboxes for efficiency.

I rented a new Ford Expedition for a week in late 2018 in the northern Rockies and the 2.7L 4 cylinder, 10 speed auto moved that big cinder block 1500+ miles all around western Wyoming and SW Montana for a week, with an average MPG of 21 or 22 mph. It would get up to 24-25 at 70+ in the interstates, even with the hills.