I have the small v-8 in a half ton,4.8 it will get 17 mpg on it's best day at 50 mph or less. I avg. 14-15. I have had
a 2500 with 4.10's and you can't expect more than 12 mpg
avg. under 50mph. you are pushing it after that. I had
a friend who got 9 mpg with his 2002,sold it and bought a ford diesel. My plumbers 2003 GMC 2500 diesel is always in the shop. $4000.00 extra for
the diesel and their cost of operating will buy a lot of gas.
There are forums out there that will give you the skinny on
this subject. Salesmen will say and do anything it takes
to get you to sign,that is how they pay their bills.

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