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Yeah the newer car have more gears which generally should equal better gas mileage plus turbos etc. The 3.0si isn't bad though. My wife's would get 28-30 mpg on the highway in Florida with drop in filter. When I threw on roof racks it dropped to 24mpg highway. We get 21mpg mixed here in Hawaii and it has the PBX tune. This thing gets great MPG for a 5k lb truck!
OP, maybe you're having other issues to resolve. Maybe get a drop in filter like K&N and swap spark plugs. Then reset the tranny and see how it goes. Also, make sure you have all of your panels under the car. The whole bottom should be covered in plastic except under the muffler. Missing one can affect the MPG. The tires could be affecting you also.
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