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Hi, 85. You've got a great car there.
Just curious, how fast do you drive to get 65mpg highway? On flat land, you may want to go slow enough to keep it in lean burn, which guarantees you 75mpg cruising. On hills, you could pick up fifteen more mph by lean burning down the hills and keeping it at 50mpg going up the hills. Or you could slow down and engine-off coast down the hills.
I'm sure you could pick up a few more MPG with an engine kill switch. You should also install an assist/regen disable switch. Assist is helpful for allowing reasonable acceleration at lower RPMs, but it depletes the battery, and payback is a bear.
A MIMA would be the ultimate IMA control device, allowing you to apply assist and regen on demand. You can also set it to apply assist when your mpg falls below 80mpg (approaching the limit of lean burn) and apply regen when it climbs above 110mpg (where the engine is too lightly loaded to be efficient). That would be extremely helpful on hilly interstates.
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