- Jul 14, 2002
I just came back for a cross-country trip from NY to Los Angeles, CA. I took the interstate 40 which I believe is the old Route 66. Anyways I had ample amount of distance to monitor the fuel economy of my 8.1L Av. The average speed of 75mph, 6 mph crosswinds, my mpg was 14-15 through most of the states...New Mexico and indiana I averaged about 16-17...almost if not always getting over 500 mile to the tank. My main concern was the truck no being able to take a full tank of gas each time...which may have threw a glitch in the mpg estimates.