Why?
Ford did not drop the 36 gallon tank on the 2011's. From my understanding of it, it is equipped on all extended and crew cab f150s equipped with the 5.0 or 6.2L motors. I can definitively say my 2011 5.0 crew fx4 definitely has the 36 gallon tank.
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I bought mine off the lot, 2011 w/the 5.5ft and it came with the 36 gallon tank standard. It seems like Ford is attempting to keep their distribution of 36 gallon tanks somewhat of a state secret.....






