break in

[FreddyChevy]

Hi all I just got my 2002 2500HD D/A crew cab about four weeks ago. I have only filled it up 4 times and seem to be getting only around 14.5 mpg. I am guessing that this is normal and mpg will go up as the truck breaks in. How long should I expect this to take not really working the truck and what has the mpg's been for all of you?

Thsnks

[NickLeinonen]

get about 1000 km on the engine and drivetrain, and then go and beat the **** out of the motor [manual trans works best, cause you can lug the motor, autos like to downshift]. go and pull something real heavy. high combustion pressures seat the rings real good. if you don't use the motor, you can get glazing on the rings [not sure if it applicable on the dmax, but on bigger OTR trucks, big issue] and then they will never seat.. :(