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Old 01-16-2011, 12:44 PM
erm
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My diesel truck manuals never said anything about towing for 1,000 miles to seat the rings or that it was needed to improve mileage.

I have noted mpg improvements over time with new vehicles but the mileage amount varied.

An intake and exhaust will help that Cummins breathe a bit better and that should make it a bit more efficient. But, I think you are just gonna have to put some miles on the truck to see the improvement.

Also, don't necessarily rely on your truck's computer generated mileage results. It is an adaptive system that changes with driving conditions quite a few times within the total miles required to empty the tank. I suggest you compute your mileage the old fashioned way... miles driven divided by gallons consumed.
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