I've talked to service managers on this issue from many different brands/dealerships (GM, Dodge, chevy, Ford, Porsche, BMW, Volvo, to name a few). Certain cars are more susceptible to fuel injector deposits than others. I have heard from several that there is a big difference on cars for people that always run the cheapest gas they can get vs. people who use top tier brands. But this would not be true for some old carberated car for example. For sensitive cars, running a top tier fuel is a must IMO. If you have some old pickup, it is not going to notice the difference between cheap chinese gas (arco, etc.) with minimal filtration and top tier gas that gets more filtration. For me I always use top tier gas such as Chevron because keeping things clean is important to me.