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Old 10-06-2014, 01:17 PM   #6 (permalink)
adam728
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Join Date: May 2008
Location: Michigan
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Mazda3 - '08 Mazda 3 S
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Quote:
Originally Posted by mcrews View Post
I coast in gear as I heard on top gear clarkson said

"A modern engine uses no fuel coasting in gear"

of course it does......
an engine uses no fuel when it is turned off.
I think you are misunderstanding, many (most?) newer engines are calibrated to cut injection completely on deceleration. When it kicks back on depends on a whole slew of variables, engine rpm, engine temp, catalyst temp, gear selection, etc.

Hard to use any fuel if the injectors are not firing.
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