I'm not sure what a GMT900 is, but I have an 03 GMC 2500HD Crew Cab w/ a 6.0L turning 37's. My gas mileage is crap. 10.6 Daily, about 13 highway
I'm not sure what a GMT900 is, but I have an 03 GMC 2500HD Crew Cab w/ a 6.0L turning 37's. My gas mileage is crap. 10.6 Daily, about 13 highway
'03 GMC 2500HD CCSB SLT/6.0/AFE Stage 2 Cold Air/Magnaflow Cat Back/ 8in Fabtech Lift/ 37x12.50x17 Cooper Discoverer's/ 17x9 Raceline Wheels/ Debadged/ Vortec Performance Tune (COWL327)
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