I have a 2002 3.0 with 180k miles on it. Had it for 6 years now and have averaged 16-17 mpg with mostly city driving. Just had all the spark plugs and cables replaced and am now averaging 17.5 . Best I have ever gotten on highway driving was 23 on a trip from Houston to Dallas with cruise set on 75. I could probably get better than that if my fellow Texans knew anything about lane discipline. Lol