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1) My mileage varies from 59 mpg with a full tank to 62 mpg with an empty tank. 800 daily commute data points are consistent. 10 gallons, 6 lb / gal gas = 60 lb.
-60 lb (2.6%) = +5% mpg
2) On a certain route, with my family on board, I got 56 mpg with ideal conditions yesterday. Compare that to my 63 mpg average on that route, driving solo.
+200 lb (9%) = -11% mpg
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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