Yesterday I went to San Antiono (Roughly 200 miles one way) and checked the gas mileage, now I do have P-245/40/18 tires so I really don't know how far the the speedo is off, but here are the results
On the the way up driving 74 mph then , the last 80 mile I followed a Excursion running 80-90 mph . Filled up 13.1 mpg
On the way back ,set the cruise at 67 mph then once I hit Houston ,set the cruise on 64 mph filled up the next morning 18.4 mpg
I haven't had the truck long so I thought I share my experience.
On the the way up driving 74 mph then , the last 80 mile I followed a Excursion running 80-90 mph . Filled up 13.1 mpg
On the way back ,set the cruise at 67 mph then once I hit Houston ,set the cruise on 64 mph filled up the next morning 18.4 mpg
I haven't had the truck long so I thought I share my experience.