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It does use less gas in gear, but the running the engine at higher rpm adds a lot of drag. It adds more drag than the fuel cost of idling - you slow down a lot faster and have to use more gas later. Use neutral. It costs more right that instant, but in the big picture of a whole trip it saves more.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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