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I have tried to dial in the calculator tool too. Like you, had to guess on some stuff.
But, one I didn't, was engine thermal efficiency. Happen to have a full speed load map for my engine. At my road load (near 100 HP) and RPM, it's 31%. I know your engine is totally different, and should be more efficient, but you're probably at a lighter load, so maybe it's close to a wash? In other words, I'd say your 32% guess is pretty close.
Where did you get .893 for your driveline efficiency? Seems like it's a pretty precise number? Or just one that made your data fit? Speaking of that, when I put your numbers in I get 17.08 MPG at 80MPH, is that right? That's your baseline, right?
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