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I had a 7.3 in an F250. I currently have an '03 F250 with the 6.0. The cab and chassis and creature comfort items in the '03 are much superior to my old 7.3, and at first the 6.0 was quieter, had better power and Q, but the mileage was nowhere close. Combined mileage in the 7.3 was 20, combined in the 6.0 is 17. I was convinced that this was the best truck that I'd ever had, even with the hit in mileage.
Since week before last when Ford performed their latest flash on my PCM-without my permission I might add-the 6.0 is louder, it seems to have less power and torque, and the jury is still out on the mileage; i.e. whether it's better or worse. When I say it SEEMS to have less power, it's not a dyno proven fact, but more of a seat of the pants feeling, especially when trying to pass. Now I wish that I had my old 7.3 in my current '03. If Ford has not reflashed your computer, I wouldn't take the truck to the dealer for ANYTHING unless it was unavoidable. They'll flash the PCM and then shrug it off when you complain. I feel a Chevy in my future. Maybe even a Toyota should they come out with a diesel. I've been driving Fords my whole adult life, and have been a loyal customer, but this latest has really pissed me off. Good luck with yours.
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You can forget about that Toyota diesel, Four wheeler magazine is quoted as saying both Nissan and Toyota have killed their heavyduty truck idea stating that with rising fuel prices their $$$ is better spent developing other vehicles. Fine by me.