I run a bottle of Techron through the tank before every oil change. It's good stuff and using it as a PM method rather than waiting until things are gummed up is a good approach. Why pay the dealer hundreds of $$ for them to do a "fuel injector service" when you can keep them clean yourself ? Redline fuel system cleaner is also highly rated. I also add some Marvel Mystery Oil (about 6 oz) every 2-3 tankfuls. It does not serve the same purpose as Techron, it acts as a lubricant/solvent for the fuel pump and sender unit to help counteract the crappy gas we get here in CA, even the top tier brands. I find that after a tank with MMO added, the often cited problem with the gas gauge not showing a full tank when known to be topped off goes away for a while so I have pretty strong evidence of it's efficacy.
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