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Only way I see that a gasoline would help FE is if the gasoline had a very high octane rating, which would allow you to jack up the compression ratio and dial more spark advance, both of which improve engine efficiency.
There may be some brand to brand variation in heating value but it can't be much as they all have to meet API specs.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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