Good point but, all things arent equal adding the 6 speed tranny changes everything. Im sure that in 2007 adding that 6 speed tranny had alot to do with the mileage boost so they decided that they could go back to using regular gas. (better selling point to customers who dont want to buy 91 octane) And the EPA stayed off their backs too. Just speculation though. I just think of it as if it was my car company, what would I do and thats what I would do.

 

Very good point. Could be.

 

Got a 6 speed in my 06. Just thought I would throw that in to muddy up the water some more

 

Im just guessing but your truck was made in the end of the model year'06? If so then they wont change the owners manual mid year, they would wait till the next year came out.

 

True. Actually the owners manual the dealer gave me was for an 05. (better than not having one at all though) But my gas door says 91+.

 

You can download a PDF version of your owners manual at:
https://www.fleet.ford.com/maintenan...ls/default.asp

 

cool Thanks