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My normal everyday commute to work is 120 miles round trip... I drive an 05 Mazda 6 w/ automatic.
I coast in N, with engine running @ idle speeds, a combined total of approx. 3.5 - 4 miles per round trip commute depending which rout I take... I have been doing this w/ no problems for over 5 years, and although I haven't quantified my neutral-coasting gains ... I feel confident that it is helping... my FE ranges from 27 mpg to 30 mpg per tank depending on how I drove that week.
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