I have an 2011 F150 with a 3.5 eb with 245000 miles. At 185000 I had an exhaust manifold replaced. At 200000 I had the cam phase stuff repaired. I do not experience any turbo lag while towing. The ho charts show almost full hp at 1800 rpm's and my experience towing gives me the butt meter that agrees with this. While towing in the Rockies, I leave my digital display set on tranny temp and shift if the tranny starts to get above 200 degrees. I rarely have to go below 4th gear (6 speed tranny) I am leaving for the Rockies in the near future with this truck towing my TT.