What brand trucks are known to get the best mileage? Is 6 or 7 MPG attainable in a OTR< 48 State truck? Thanks for any input..

ANY brand of truck can attain good fuel economy.............

its the engine, transmission, rear axle ratio, the weights you carry, and probably most of all, how much pressure is applied to the throttle by the right foot, and then of course, how much that engine is idling........

so in all reality, it ain't the brand of truck, its everything else..........

Thanks for the reply. Also how much of a difference could one expect between a aero body style such as a Kenworth T600 vs. a more classic style like W900 or Pete379

Aero body styles are known to be more fuel efficient. That's why they make them. Your big classic trucks with all kinds of accessories, air cleaners, etc. hanging off are going to cause more drag, which will reduce mpg.

There's so much that goes into fuel economy, that there's no real answer to your first question. For your second, yes, an aero body like a Kenworth T2000 or Volvo VN will have a better chance of being fuel efficient.

I have a 2000 Volvo VN Series, and I get 6-8-7.2 mpg. I drive # 65mph with the cruise on, and try to keep my rpms below 1500 when shifting. I have also switched to Amsoil full sythetic oil throughout the truck, added a fuel efficient muffler, and switched to Michelin's X-Ones on the drives (XZA3's on steers).

This is in the hilly territory of Georgia/Alabama/Tennessee with average of 3 stops per route, and lots of city driving. If my routes keep me rolling on the interstate, I'm sure my mpg's would improve. I've seen 7.4 mpg on my longer trips.

I drove a '98 Volvo 610 for awhile that had the 425 Volvo with 13 speed. It averaged 6.4 MPG over a year. Just sayin'.