Jim, I think the key in what you’re saying is that it depends on terrain, speed, wind, the type of load a person is carrying, etc. In California, where I usually hang out, the posted speed limit on the interstate for any vehicle towing is 55-mph; if you go over 55-mph when towing you can get a ticket.
Now I have towed at 75-mph and found that my gas mileage was around 8-mpg, but when I tow at 55-mph my gas mileage is between 11 & 12 mpg. Terrain is also a factor as I can only tow over a steep grade at about 40 to 50 mph and a strong wind coming my way also slows me down. These have an effect on my gas mileage as well.
But on average I get about 11-mpg when towing with my F-150. As a fulltime RV’er, over the past couple of years I’ve owned this F-150, I’ve planned my trips and estimated my gas budget based on 11-mpg, and that has been rather accurate for me. Nonetheless, I do agree that different drivers of the same type of vehicle may get different results regarding gas mileage.
Larry:)
P.S. 150-miles in a couple of hours amounts to driving at 75-miles per hour; maybe your friend should slow down a little.
