Economy vs. speed - drive slow to save gas? BNW Z3 - 29.7 mpg at 80+ mph

The OBC gives spot-on mpg readings vs. manual calculation of miles per gallon. Surprised me, but there it is.

Reply to
Geo
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Huh? Exactly how does an oxygen sensor in the exhaust gas stream respond in any way to the octane of unburned gasoline?

Reply to
Geo

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