The fuel tank add ins for cleaning injectors supposedly work pretty well. I have used it and noticed an improvement. As for your gas mileage...well 89,000 miles your are do for some work. Throttle body service to clean all the carbon off of the throttle plate, fuel system cleaner, fuel filter, air filter, new distributor cap, rotor, wires, plugs (i highly recommend using only mitsubishi parts for the ignition system and fuel fitler), you should also do a transmission service! All of these will restore your car to its original fuel economy unless there is a problem with the vehicle. but condsidering you only dropped about 15%, this serious tune up should do the trick
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