additive at gas station

Is it worthwhile or a waste of $ to get the fuel injector cleaner that automatically dispenses with gas at gas stations?

They offer additives at the pump now? I have yet to see that. Anyways, yes once in a while you should put a fuel injector cleaner in your tank, but definitely not every time. I use techron from Chevron, it's pricey but I think it works the best.