I assume you changed the transmission filter also when changed the fluid. It sounds to me like a bad tranny. It is not normal for the car to reach 3200 rpm when driving at 75-80 mph. This must be caused by clutch slippering inside the tranny. The loud screeching noise in reverse is very compatible with worned clutches. Also the low gas efficiency is also compatible with clutch slippering. All arrows point to a bad tranny. Good luck!!
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