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Old 05-05-2021, 01:02 PM   #21 (permalink)
aerohead
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HWY mpg

A thought experiment, because it's safe, would be to draft a semitrailer at very close range on an isolated test course, at your chosen velocity, and see whether or not the engine could reach anywhere close to your target mileage.
If that didn't do it, nothing would. A Go NoGo.

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