If ya need injector service this early, you buy some dirty gas, or you're runnin the tank dry before fill ups. You shouldn't run your tank past a 1/4 tank due to burnin your fuel pump out any how. You can put injector cleaner in your tank to help clean out deposits, or you can have them do it. What they'll do is hook up a cleaner solution to drip into the fuel line as the truck is runnin to directly clean the injectors. With the right equipment any one can do this. So if your concern is price, tell them to give you their service quote then shop around other shops, like sears
or jiffy lube ect ect. Your brakes are understandable, because toyota brakes suck. Switch to duralast gold and you'll notice a huge difference. Just be sure to either resurface the rotors or get new ones. Don't go cheap either. There is a huge difference between the economy rotors to the high end ones.