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Originally Posted by helomech
Hell I have a hard time driving 3 hours without stopping. I am sorry, I just do see a 5.3 getting 4mpg better towing the same load. Maybe I'm wrong, but I doubt it.
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i agree i helped my friend move from phoenix az to las vegas nv and th had an03 gmc sierra w/ a 5.3 we were towing a 1998 nissan sentra an a 14 ft flat bed trailer and his trucks tranny was all over the place...
there is now dbout in my mind that a 5.3 w/ a 4 speed will get better milage, but 4mpg better than a titan w 5 speed towing 3000 lbs seems a little far out... either way good luck on your trucks no matter what you go w/