They're about all the same on the highway. 02-05 3.5's have the same gear ratio, same trans, etc.
Gas mileage varies, but generally sucks overall. I think my '05 gets around 19 or so on the highway with A/C, and probably 15ish in the city with A/C.
Interestingly, I got BETTER miles per gallon pulling a 4000ish pound dual axle trailer cross country early last year.
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