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RE: bad mileage
Robbie said 2005-10-24 04:14
1st Question: What type of carb or mods do you have? I have an 80 XLH with a 1984 XL Harley/Makuni carb with a #56 main jet. I am gettin about 40 MPG on the back roads doing about 45 MPH but only get around 30-33 MPG on the highway doing 65-70 MPH. I did discover that adding 1/2 oz. of Marvel Mystery Oil at every fill-up improved my milage and overall power range.......