Yup, about as aerodynamic as a cinder block!
I get maybe 12-14, if I keep my size 14 out of it. Haven't really checked what my highway mileage is, I've only taken one long distance trip in (Danville, IL to Greenwood, IN), and really couldn't get an accurate reading as I spent too much time trying to find the place I was going due to faulty Mapquest directions. I'll take a guess and say it isn't any higher than 16-18, tops.
BTW, for those not familar with mine, it's a '55 2nd, 235 with dual Holleys, Fentons, an overdrive 3 speed, stock 3.90 rear gear, and 30" radials all around.
