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P&G definitely works with engine-on coasting. My record so far was 39.7 mpg in my Saturn Ion (5 speed, 30 mpg fwy rated), and this weekend, I rented a Malibu (4 speed auto, 29 mpg fwy rated) and averaged 35 mpg in mixed city/hwy driving. Both done with engines on at all times except in the drive-thru.
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