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I bought a 04 Crew Cab 4x4 LE and was wondering what service it might need. My gas mileage has declined from 14 a tank to lower 12's over the last few months. Same driving with actually more highway lately so something. Does everyone get the services done?
 

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My economy always goes down by a couple of miles per gallon in the winter. I think they do something with the fuel that causes this. I have around 67k and have done all the tuneups and every winter the mileage has gone down.
 

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Happens to me as soon as I put post Nov. 1st gas in the truck. Winter gas formulation. April 1st it rebounds.
 

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Same here , this time of year mpg goes down because of the fuel an also warming up the truck when it's cold eats up gas. I'd change both of the diffs gear oil 4 sure. An some 04 didnt come with SYN , so i'd put that in .

Deep.
 
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