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Just checked it over the weekend and my car does use less gas in neutral than D at idle. I got around .21 gph in drive and around .19gph in neutral. Not a huge difference but it seems to me it's worth it because I do a lot of city driving.
Also, I'm not even going to try neutral coast with my automatic. The fuel injector turns off when I coast and claims that I'm not using any gas in this stage. I get 0.0 gph when I do this. I don't know if it's really using no gas at that point but I don't know if there would be a way to test it with the gauge if it was.
HHINLA
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