I neglected to point out I do the multi-tankful thing on a car with a carburetor (!), so the EFI on-time calc clearly won't work there. And I'm with you on the 'in the noise' cummulative stuff like your (gascort) mirrors and stuff. It's a tough call. But even coast-down would need multiple runs to average out wind and other factors.
I'm looking through various airdam threads for technique and testing methodology. My ancient car has I think a lot of low-hanging fruit.
I didn't see concrete results for Darin's lovely cardboard hack -- just a casual result from the meet. Did I miss something?
MetroMPG -- can you point me to a thread or info on practical fuel-comsumption measurement methodology? Also I apologize for coming on too strong, and I hope I didn't sound dismissive.
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