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your are correct , many cars use almost no fuel at all in cut fuel (decel mode)
i too have watched fuel calcs in this mode, cut fuel.
and mpg goes near infinity. 1500 mpg on some cars. ( full scan tool with logger , set to mpg and fuel injection Grams/min.
depends on year, and car make and ECU.
My Miata cuts almost all fuel. course it slows car so that is a factor.
but not in 5th gear, 5th just barely slows car and in fact keeps me at near speed limit. Kinda perfect in fact. holds me legal, and cuts fuel.
what more you want? egg in beer, heheheheheh
coasting is both illegal and dangerous, but few here care, it seams.
out of gear.
I used to coast down Grape Vine Hill , long ago and hit over 85. (1970)
with wind behind, upper limit is unknown, real scary. place.
Seen campers blow clear off the road there. (even going up hill at 50)
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