I just bought a clean 98 TJ 4.0L 31" tires auto trans w/83 K miles. I tuned it up w/plugs, cap,rotor, wires. Running middle grade gas. MPG I got so far is low 14.6 high 16.8. I did run with ac some of the time. Sound about right? I don't have a heavy foot, but not babying either.What do others get-I know lots of variables ( manual trans, different axle ratios,tires, 4-6 cyl engines, etc). just wondering. BTW engine idle up a little since tune-up, so it may be a little more efficent-maybe best MPG I am gonna see?.