Tonneaus
Our new truck doesn't have a tonneau cover for the bed, and we're thinking that it would probably improve aerodynamic performance (and mileage) if it did. Does anyone have experience with adding one ...
Forum Discussion
There was a magazine article about 10 years ago on improving the milage on a diesel PU. They did all the PC stuff and also added a tuner got it up to about 19-20. Added a cover and I think they got it up to around 22 or so. But who really wants to drive at 55, windows up, no ac etc.
So overall yes I think a cover will help but how much will depend on how you drive. I got one off CL for a short bed truck and then cut it to sit behind my crossover tool box so I have the best of both. A box I can get into easily and a cover for the rest of the stuff. Havent really paid any attention to whether or not the MPG changed, wanted a cover for the in bed security.
On my old truck I tried with and without a shell, saw no real difference, just gave me a higher cover to work with thus a little more verticle room.
So overall yes I think a cover will help but how much will depend on how you drive. I got one off CL for a short bed truck and then cut it to sit behind my crossover tool box so I have the best of both. A box I can get into easily and a cover for the rest of the stuff. Havent really paid any attention to whether or not the MPG changed, wanted a cover for the in bed security.
On my old truck I tried with and without a shell, saw no real difference, just gave me a higher cover to work with thus a little more verticle room.
