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I have a 475/550 Cat that gets poor fuel economy. I recently had it tuned up and turned up to the 550. The mechanic at the Cat garage said that my fuel economy would improve, but it hasnt. I've heard that other guys are complaining about the same thing. I only have 420k on this truck. Any hints...

I have been reading alot of what some guys are saying about the Cat 3126 motor. I have one now, rated at 250 hp. This motor has been great. It has plenty of power for expediting, doesnt smoke, and averages 9.5 mpg. I honesty feel that the reason some guys have problems with this motor is due to...