The original insight came with Bridgestone Potenza Re92. That specific size is, I believe, still the lowest RR tire out there. Otherwise, I'd look at the tirerack test, or talk to basjoos who runs the same size. He gets to test a fair number of tires with the miles he puts on.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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