Has anyone swapped out a 2.9 L for a 4 CYL? My son's 1990 2.9 L is leaking oil and I am wondering if I can replace it with a 4 CYL and if he would get better mileage. He currently get about 15-17 mpg. Alternatively, would I get better mileage with a rebuilt 2.9. The trany is a automatic with...
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