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The 2.5 isn't all that much better on gas. You have to lose the weight, in other words, go with a car having the same amount of power. You will get much better gas milage and a lower weight to horsepower ratio.
 

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chester_peabody said:
I know there's a big difference in mpg I had a 91 with the 2.5 and got 25mpg. My 92 3.9 gets @16mpg. It's a big enough difference with gas being shitty to make me wish I had the wussy 2.5 again
Sounds like a bad 3.9. My 5.2 is getting 18 and many 3.9 owners are getting over 20. Was the 3.9 in a 4x4?
 
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