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I can't help with the trans except to ask if you have had it serviced. Trans service is recommended at 60K I think. Bad fuel mileage can also be caused by fuel line constriction, like an old fuel filter. There is no recommended interval on these, so they tend not to get done at all. Most cars recommend 15-20K replacement, and my old chrysler used to need a new one every 15K. When fuel economy and power dropped, I knew it was time. The filters (air, fuel, trans) may be a decent place to start.
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