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I agree with not lugging your engine just to get better mpg. Personally I hate it when I cruise close to idle (say 900 rpm when the idle speed is 700) but my car feels pretty comfortable at say 1300. Plus the car starts to sort of misfire when you get at or below idle. However one thing I don't know is if it is safe to coast at idle while in gear when the engine doesn't seem to be struggling.
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