Calling all 2500hd owners

[COWL327]

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

You need to get Nathan to fix the max tire size in the BCM and then we can finish tuning yours.....Nathan you need to get this fixed for him if you can.We are getting service brake system messages because of the tire size!