The newer ones have far more power. However, the 190hp 3.6L I6 with tall gearing in an 88 is fairly underpowered. The geared them lower in 89 for better power, as the 88 was the first year with an overdrive auto, but kept the original gearing. The 88 therefore gets better mpg. It'll lock the TC around 55mph minimum, at which point it's turning a bit under 1500 rpm, IIRC.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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