Fuel injection cleaning, change spark plug wire, O2 sensor change?

How old are your components, you will pass without the work but maintenance might get you 2-5 mpg more. Toy wires last, if yours are original then replace them with Toy wires Non Oem might last 25-50% as long, dont forget the rotor, Is the cap attached to new wires. Plugs should be replaced at maybe 70000-90000 if they are platinum. Forget fuel injector cleaning, your gas has cleaner in it, or go but a 6$ can, you did say you run smooth. To improve milage-power and reduce pollution check ignition timing. A bad 02 sensor reduces milage but you said yours tested Ok. Your mech basicly just wants to sell you a bunch of unessecary work on the pollution basis, Milage determines maintenance, read your manual.

O2 sensors may go for quite a while yet, especially if the engine is not using significant amounts of oil to coat the sensor with carbon.

If the car is used mainly for town work, as opposed to on the road company rep work, I'd just monitor the fuel economy from time to time to inidcate the sensor's condition.

If those plugs and wires/leads are original, its pushing the envelope a bit to expect them to be as new. Once spark-plug leads start to rise in ohms, after a continuity test with a multi-meter,.the chance of failure increases. Once a lead goes open-circuit, the spark voltage then finds the next lowest path to ground, and that can cause damage to the distributor and/or coil if it breaks thru insulation.

I'd look to replacing the leads with a Toyota set.

Jason

If it isn't broken, why fix it?

Take it for inspection. If it fails, fix it and get it reinspected.