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I get about +1 MPG with non ethanol gas when it's available. Pretty significant seeing as this brings me from about 9.5MPG to 10.5 MPG.
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1988 F-350 4x4, 5" lift, 37"s, 4.56 gears, C6 3spd auto, 1973 468c.i., 10MPG
1968 Ford Falcon Futura, 200c.i. I6, 3 speed auto, 2.50 rear
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