Truck towing question

6-8 MPG at 68mph is $1 every ~2.44 minutes....@ 3.00/gal! Man that sucks. Take a taxi next time, its cheaper! Just find one with a hitch. :-)
I ran a Predator Carb on a warm 351c in a 57 Fordor and got 5..I think I needed a little tuning...