Not Ranked
That mileage sounds really low to me. I have a 351W crate motor (375HP) with the Tremec transmission and can get about 20 mpg on the highway cruising. I changed the gear from the 3:73 to a 3:31 and the mileage changed significantly for the better. I would suggest looking into a gear change if you are basically a cruiser and not a hard core racer.
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