Question 1: I have one of the new Silverados that drops from 8 down to 4 cylinders under certain conditions. I would like to find out if there is any reprogrammed chips/computers that ya'll have heard of that would allow the driver to force the truck to stay in the 4 cylinders after reaching a cruising speed. It would be particularly good if this could be controlled with the towing button on the shifter (I read about setting up a different shift pattern on the towing button over on the SS forum).

I am willing to lose some power after reaching cruising speed to pick up the additional mileage.

 

Nope... That shift pattern they were talking about just changes the speed and RPM the transmission shifts...