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You can still p&g with the engine on. It won't help as much as engine-off but it will still help a lot.
The problem isn't the difference between 300 mpg neutral coasting and 9999 mpg in-gear. It's the loss of momentum in gear. You then have to burn more fuel to gain that momentum back.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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