The fuel mileage depends on a lot of factors. Lets start with what kind of trailer your pulling, weight, where ya gonna run mostly, size of motor (maker and hp/tq), transmission, rear gears, tire size,what mph you like to run at, if theres any air deflector on the truck,and flat top sleeper or ultra-sleeper just to name a few. Ya can't just say that a 379 Pete will get 5mpg cause there are way to manyy things to consider.
Quantity 1 Stock Number Year 2004 Manufacturer PETERBILT Model 379EXHD Price Location Condition USED Sleeper Size 63" Sleeper Unibilt Engine Specs Cummins Engine Type ISX Horsepower 450 Mileage 566,523 Transmission 10 Spd Check for Over Drive Yes Engine Brake Yes Suspension Pete Flex Air Ratio 3.55 Tires 455/55/22.5 Wheels All Aluminum Wheelbase 250" Number of Rear Axles Tandem Front Axle Lbs 12,000 Rear Axle Lbs 40,000
That's almost identical to mine. I get between 5.7 and 6.2. I pull a dry van. Loads weight between 15,000 to 30,000.
Personally, I would go with a 475-500 HP truck. 450 is decent for a flatlander, but if youre planning to run 48, the extra power will save you fuel and perform better. Cant see paying for a truck that will lose to a Swift truck in a pulling contest.
From my own humble experience..... 525 or better HP; and an 18 speed for those who prefer not to watch the grass grow on the 70 climbing up through Vail...
