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I have been driving a ZJ since 1998, and I have had all three engines (4.0, 5.2, 5.9). I have kept records of every fill-up since I was 17, and my yearly average is almost always 21.4. It varied very little whether I was while living in Midtown Manhattan (and the associated traffic), driving like a cabbie, or living in the suburbs and driving like a granny. It always evened out in the end. Plus, in 2000 I stopped towing and lowered my current ZJ, and put smaller tires on for the sake of handling. It helped me gain .2mpg. I figured out my break even ROI to be 11 years. Only 3 to go!
An engineering friend of mine got me interested in areodynamics and pointed me here, albeit I am far more interested in improving the handling of my cars on the highway than mpg, and since the ZJ is relegated to 95% highway (about 7k a year) duty I figure one will help the other.
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