Quote:
Originally Posted by tatca  I have a 2005 crewcab, short bed, 4X4 all stock. my unloaded mileage is 20-22 MPG driving 60-65 in rolling terrain. I tow a 10K-11K pound 5th wheel and average 12MPG driving 60MPH in rolling terrain. In flat interstate conditions, my towing efficiency increases to 14MPG. In mountainous conditions, efficiency deteriorates to 9-11 MPG.
Terrain and wind conditions, as well as your driving style, will have a significant effect on efficiency. You should also check your tire pressure. I operate my truck and 5th wheel at max recommended pressures: 80-psi in trailer and truck rear wheels; 55-psi in truck front tires.
tatca
2005 LLY, crewcab, 4X4, all stock |
My experiences are about the same as this. As a daily driver, mostly short trips (8-20 miles) I am averaging 16.5-17. Stretching out on the freeway hauling just me and family I get 20-21. Towing my 11,000# fifthwheel I have seen as low as 10.5 and as high at 12.5. It is Jayco Eagle so it is basically a square box. Aeordynamics is not really in their design criteria.
I have also hauled a small 6'x10' single axle enclosed trailer, loaded to about 4k. This square box pulled me down to about 14mpg. I feel that what you tow and how you tow it makes all the difference.
All of these numbers are hand calculated. I reset the computer to the new 265s and it matchs my GPS pretty much dead on so I know the numbers are correct. Another thing that pulls down the numbers just a little would be the warm up and cool down times. I don't just pull into a stop and shut it down. I will usually end up stopping at least once per tank for the wife and daughter to get a bathroom break. This means the a/c is running while they are inside to keep my other daughter chill'n in the back.
