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I think there's too much real-world variation to claim anything for sure. I don't doubt the mods helped, but you need ABA all-else-equal testing to know how much. Temperature, rain, wind, routes, traffic, your mood, your driving style... each of these can be a 10% difference or more.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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