Stay around 62 to 65 mph and DON'T FILL UP AT TRUCK STOPS.....
Truck stops are for truck driver's who's company either gets a discount off of the pump / advertised price when they're billed and for truck drivers for whom time is money.
If you'd use Gas Buddy you can always find a station near a truck stop that's 15 cents to 25 cents per gallon cheaper. And Gas Buddy will give you an aerial view of the station to make sure you can get in and out.
I just put two new Michelin on the front of DP - I figured they were paid for by not filling up at truck stops.
Bill