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Temperature: there's the big contributor to mpg variations. Unless you can keep that constant, or do a back-to-back controlled test, any changes from the oil will disappear in the statistical noise.
I use Mobil 1, because carefully controlled studies have shown synthetic to be better for mileage. It's also better for the engine. But the difference is small.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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