Top tier fuel is likely unnecessary. That said, if it does somehow keep the fuel system cleaner, then an occasional fill-up at a non-top tier fuel station will not significantly affect fuel system cleanliness.
I've never had a fuel system failure, and I've always run Arco gas for hundreds of thousands of miles.
FYI- Costco fuel is the cheapest in my area, and it is now Top Tier (ie equivalent to Chevron, Texaco, etc.)
It is very unlikely that cheap gas will ruin a fuel system, and even if it did, fuel systems are easy to service.
Last edited by redpoint5; 04-30-2014 at 02:01 PM..
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