Have a 2013 F150 FX4 Crewcab Ecoboost. It has the 20in Pirelli tires. I've noticed a vibration between 70 and 80 pretty much since it was new. I have 11,000 miles on it now. I've taken it several times to the dealer and had tire rotated and balanced and it did not fix it. The dealer finally told me they thought it was a bad tire and sent me to a Pirelli tire dealer. The dealer replaced the tires for $64 with no questioned asked, well it still has the vibration. Is anyone having this issued and what have y'all done to fix it. It should be noted i have owned 3 FX4's since 2009 and have never had this problem.