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Try changing oil to a synthetic and go with the 5w-30, which I believe is what your car recommends. Can also go with synthetic trans fluid, check all brakes to make sure they are adjusted correctly and not hanging. While checking brakes, check bearings and axles greased properly. Next, you can seafoam the engine to make sure your fuel inj is working properly. You can also spray carb cleaner on the throttle plate if you are concerned about it not working properly. I have a '95 Maxima GLE, did all of these mods as well as complete tune up, and get 26-28 regularly out of it.
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