My boss has a 2011 F150 Plat.( ?) with the 20 " wheels. He had his first flat on the road this week. Here is what he found.
1. Spare is 18"( not too bad)
2. Lug wrench that comes with the truck will not work on the fancy long lugs on the 20" wheels. It was cold and he got upset.
Check your lug wrench. I have this trouble with my boat wheels so I carry 4 way and deep sockets with a breaker bar.

 

I've always thought the factory L shaped lug wrench is a joke and a good way to damage your lugnuts or hands. I always keep a 4-way wrench in the toolbox.

 

The 18" spare has a similar outer diameter as the 20' wheel so issues there. So, how did he get the 20" rim off the truck? I've never had an issue with the L shaped tool but a folding 4 way is priceless.

 

I had no issues with the lug wrench on my 2011 Platinum 20" wheels. I had to use it when doing my brakes and I had misplaced my socket.

 

'13 Platinum here and my OEM supplied L-handle lug wrench works without flaw. Sorry to hear about your boss's woes.

 

The lug wrench on his truck was not deep enough to go over the round ends of the lug nuts. It was the correct size but would not get to where it would grip the lug. I looked at my lug nuts on my 13 with 18" wheels. It would be close there. I carry a 4 way and sockets because of my boat. Whoever buys my truck will have a untouched jack system.

 

One of my last F-150's, the jack could not even be removed, it was if it was welded in place instead the cab. Good thing I never had to use, but I kept a large roll a round floor jack in the tool box with tire tools, just in case.

 

I traded out my 20" Pirelli Scorpion 275/55/R20 for Goodyear Wrangler AT/S 275/55/R18 which is what the stock spare. They are close in overall diameter but not exactly. The Goodyears with the 18" rims are about .16 larger in overall diameter.

You wouldn't think that would throw off your TCM odometer settings, but it does.

Throw in the tire iron issue, cost difference of the tires for 20" rims and switching over to the stock tire size was my preferred decision.