The difference in coasting distance is huge. You're absolutely correct about it still consuming fuel. I'd say it depends on your speed. If you're going 55mph or more, coasting at idle isn't much different than with the engine off. If you're going 5mph, you're almost idling at a stop, which gives you zero mpg. As always, "it depends".
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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