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I have to disagree with the logic of your three points. You're not getting ERRORS in measuring fuel consumption, because the car's instruments are pretty darned accurate. Specifically:
1) Any halfway decent driver can get better mpg without using cruise control - in any car, but particularly in the Insight.
2) You can control regen/assist with a MIMA setup.
3) Again, those aren't fuel consumption error, they're actual fuel use.
It does seem less than logical to get a car that's optimized for high mpg, then complain because the optimizations make your testing difficult.
However, I'd suggest a different, and possibly more accurate, method of testing. Find a hill on a non-busy stretch of road, start at the top at a known speed, turn the engine off, and measure your coasting distance.
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