You really really really need to turn it back on as soon as the engine has stopped. You'll actually count for those missing miles. Even more important, all the electronics will be working. Little things like ABS and airbags. Be safe.
Mine is off more than it's on. Default mode is off and coasting. I turn it on when I need a boost, then it's off again.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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