Fuel Injection cleaning by Toyota Service for $175?

I don't think I would wait until 100,000 miles. 25,000 is very low mileage and they have no idea if you have build-up. They are trying to rip you off. I would however suggest having an actual injector cleaning at 50,000. The stuff that goes in the gas tank dilutes down no matter how much gas is in the car. The actual injector cleaning involves hooking a tank or machine to the fuel rail and running the vehicle on the cleaning solution. It doesn't run any of the gas through so you are not running a diluted cleaner. The cost for this service at most service garages is under $100.