Paul ONeal

Hi all, have a 2020 GMC Sierra SLT 3.0 with the stock goodyear tires. I have added the gmc floor liners , bedrug , and gator bed cover. I live in NC, was able to get 26.5 mpg on a 240 mile relatively flat highway trip to the coast doing the 65-70 mph speed limit. I've made that trip a few times this summer. Now, I just did a 230 mile trip from Greensboro to Sevierville TN near Gatlinburg through the mountains. Very dynamic road conditions, some 6-8 degree inclines and twisting roads. I was towing a 2010 Jayco x23b camper, about 4900 lbs dry, maybe a couple hundred pounds gear in the camper and other couple hundred in the truck bed. 2 adults. I averaged 13.6 mpg up the hill and 14.4 back down. The trip was made speed limit or below. I saw another poster did a little better towing an airstream. The airstream is definitely more aerodynamic.