Everybody's vehicle will vary depending on tune, way they drive, and little things, like wheel alignment, if brakes have any drag on them, where you live. I get a kick out of Chevrons claim, our gas gets best mileage. I used to buy Chevron because of credit card. My mileage never varied always 9-10 city, 14-15 straight highway. Didn't matter winter or summer, never changed. You can take 2 vehicles with same mileage, both pass smog tests with flying colors, one gets 10 the other 12, why? It boils down to looseness of motor, trans, brakes, and the way the 2 drive. Me I drive like a Grandpa, my brakes go 40k, but my mileage never gets above 10 city/ short highway driving.
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