20.743 hand calculated miles per gallon since I picked up the truck in July 2005.):h
Based on my experience it will. I do a 70 mile round trip to work that is 95% highway. If I keep the cruise set at 73 mph I get 20-21. I've got 50K on the truck so I don't expect that it will improve. First 15K miles I was lucky to see 18 mpg.I'm gonna keep my fingers crossed that it continues!