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I mean a real-time gauge. Unless you can tell whether that last quarter mile helped or hurt your mileage, you're just shooting in the dark. When I got my Scangauge, the very next tank's mileage was a new record by 10%.
Rolling in gear but off the gas... It may be shutting off the fuel, but you're getting a lot of engine braking. That costs you fuel to get back to speed later.
I recently did a 1200-mile highway trip in the Odyssey van, rated 16/23. Thanks in part to strategic neutral coasting, I got 31 mpg for that trip. The neutral coasting, I estimate, was worth about 2 mpg of that.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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