After 2 bad experiences (TowMax, need I say more) we upgraded to G'year G614's which I think I could pull coast-to-coast at 70-75 mph. But I still loaf along at less than 65. I could say it's easier on the truck, easier on the 5er, easier on the tires or easier on my pocket, but truth is, it's easier on me.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks