I get 12.5mph, but I do not milk the throttle. I floor it to the speed limit and let up. I have gotten as high as a 15.5mpg when milking it. If you are worried about the antenna, get a Stubby Antenna from Craven. Your 12' ramps are more than plenty to load the bikes. Hell, they are too much because you would have a short bed.
Antenna removal issue: The 11's have an issue of you need to get under the fender to hold the stud when unscrewing the antenna.
Antenna removal issue: The 11's have an issue of you need to get under the fender to hold the stud when unscrewing the antenna.