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I just yesterday sold a 97 Dodge 2500 with a Cummins diesel. When I bought it the truck had 4.10's and I couldn't get more than 17 mpg on the highway. I swapped in 3.55's in an effort to increase mpg and it really didn't make much of a difference - and may have actually hurt mpg in the city. I did get nearly 19 once - but for the cost of the swap it probably wasn't worth it in hindsight. Oh well - not my problem anymore!
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