Mpg on a mild 360?

WRB426 said

This was my question.
Run a test. Fuel up run it on the highway for a half of tank. Then refuel and do the math. Real numbers is the way to go.

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Like you said....fill it up, drive 50 miles or so and fill it again. Divide the miles traveled by the gallons used.... Bingo!. Your long trip mileage should increase by a slight bit if driven easily.