How much of a mileage difference is it for on vs off?
Another quirk I noticed in my experiment was that my engine doesnt like to spool down at all - after accelerating up to 75mph, I push in the clutch, it takes a good 5-6 seconds to slow back down to idle. Since my glide time (unless I go really slow) isn't much longer than that, I can't see getting any mpg saving at all unless I shut it off the moment I push the clutch.
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