Yeah, I just can't help to speculate on the FE improvements either. We could have a lottery;-) My guess is about 10% improvement. I'm basing this on Metro's 15% with his boattail on a car which had a much worse rear section. The Insight is already pretty good, making improvement more difficult. That's my guess anyway.
A 10% solid improvement would be huge in my opinion. It would allow pretty reliable lean burn operation at 60 MPH in most terrain and that in itself would be a huge improvement. Anxiously waiting ;-)
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