Sorry, mikemoss, your company got hosed just like me. I own a '04 6.0 liter Powerstroke regular cab SRW 4x4, and I do a lot better than 9mpg, close to 18 mpg overall. Not bad for a 6000 pound vehicle, but I expected to get well over 20.
I remember the good old days when guys with 5.9L Cummins / Dodges were getting 22- 25 mpg highway. Even Ford 7.3's got well over 20 regularly.
How much does your dually weigh? Truck makers have been building bigger and heavier each year for at least a decade. It's no secret that the key to great diesel mileage is to keep the engine size down and the truck weight down.
GM, Dodge and Ford all have access to smaller diesel engines. GM installs 5.2 liter (Isuzu) four cylinder in its medium duty trucks. Dodge could install a 4 cylinder vatiant of the Cummins, they made 3.9L 4 cylinder truck engines for years. And Ford / Navistar installs 4.5 liter V6s based on the 6.0L V8 in its medium duty trucks. It's frustrating to see FE engines in Class 4 - 5 trucks but unavailable to pickup buyers.
I'd love a truck that gets better mileage, but my wallet is staying in my pocket until somebody makes a truck that gets 25 mpg highway again.
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