I left today on a road trip from Thousand Oaks, ca, going to Benton Harbor, Mi., and returning in a few weeks. I've got a stock 2010 sc w/6.2.
So far today we've covered 580 miles and have averaged 14.7mpg at 80mph.
We climbed to 7300 feet in Flagstaff, Az, so the milage might improve in the...