| I have a '06 Crew Cab and pull a 10k lb. 5th wheel here in colorado. Unloaded highway mileage on the flats is about 20 to 21 MPG at 60 MPH., bump that up to 70 to 75 MPH and it drops down to 16.5 MPG this was trying to save fuel so I was in light traffic and keeping a steady speed. Pulling the trailer drops it down to 10.5 MPG at 60MPH and 9.5 at 65 MPG. Driving up passes is another story. Now, I never complain about fuel mileage because I had a 02 GMC 2500HD with the 6 liter gas engine and it only got 5 to 6 MPG pulling this same trailer at 60MPH |