TJ fuel ecomony
My 4.0 auto is averaging 200-210 miles per tank, 30" stock tires. My best was 240 per tank, with a 220 average. It seems to have gotten very bad very quickly, which is making me think the computer is getting a wrong reading. The motor has 59K on it, fully tuned, new air filter, and Mobil 1 only. It also flew through NY State inspection in January. Is 12 miles per gallon average for anyone else, and is there a self diagnosis test I can do to check the sensors? I used to be able to do the self test on my '94 (the key on key off 3 times I believe), is it the same for TJ's? Also, does anyone have the code listings?