Quote:
Originally Posted by rkpatt
I have an 1998 Olds Delta 88 3.8 ( inherited from an elderly relative in 2004 with 24 k miles ) that was getting 22 mpg city and 28 mpg hwy . The mileage has dropped considerably of over time down to 17-23mpg . The car has had regular maintenance . A full scan ( with a real sacantool ) showed everything functioning OK . A tune up did not help . I now have about 71K miles on it and wondering what I can do . Any suggestions to get that mileage back ? - Thanks
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You could always try the old reliable Seafoam treatment. If there is significant carbon buildup inside the top end this would certainly have some benefit. How much of the car's usage is city driving? I would think bad compression would be unlikely at 71k, but anything is possible.