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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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