[dishow]

well, in my opinion, the 4.8 isnt going to get any better mpg than the 5.3. expecially in the heavy crew cab. plus youll get the 6 speed auto with the 5.3.
a few years ago i had a f*** f150 crew with the 4.6 instead of the 5.4. not doggie,but no get up and go eighter,and i didnt use it to haul.
ive got a 2011 ext cab now with the 5.3.LOVE IT! Looked at a 2010 crew w/4.8 when i went to buy my truck and went with the 2011 cause it didnt want to opt for the smaller motor............again. just my 2 cents.