smslyguy
November 10th, 2009, 01:34 AM
I have a completely stock 2000 gmc with a 01 c.o.s. and i average about 14.5 m.p.g. I am looking for anything to help me for a few extra m.p.g. I have turned off cat protection, and tried bumping the timming 15% at cruising speed, but not much luck with any of these. Any suggestions????
the truck as 120,000 miles and is tuned up as well.
the truck as 120,000 miles and is tuned up as well.