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I haven't been too up to date on here, and this thread is old, but coasting today in my wife's 2008 Ford Escape 4 cylinder auto had roughly a 25% loss in efficiency by putting it in neutral. It went from 80s to 60s. Watching more carefully, rpm went from 900ish to over 1200 in neutral.
I just setup a grille block, so put my scanguage in and was checking it out, I couldn't believe how efficient they are. 31 to 33 mpg with the grille block, 27-29 without. City driving, me driving. My wife seems to average around 24.
Just an observation.
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