IIRC, Walmart and Sam's Club sell Murphy USA gasoline, which is not top tier. I have used Sam's Club gas in both my vehicles, and they ran just fine on it without any major difference in mileage or performance.
HOWEVER, I avoid Sam's Club gas in my BRZ, because it turns the minor chirping of the fuel pump into a cricket symphony. It sounds like I have the whole swamp under my hood. It's the only time I've ever really been annoyed by the chirping crickets. I don't know what the hell they're putting into their additive package to cause that reaction, but it is immediate and impossible to ignore.
Quote:
Originally Posted by aegisdrgn
Top Tier gas is just a distinction for gas that has the minimum amount of detergents deemed necessary to keep an engine from gunking up too soon.
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The top tier gas standard also requires that the fuel contain at least 8% ethanol. So the folks who search out ethanol-free gas in an attempt to avoid crickets are not running top tier even if they buy it from a station branded as one of the top tier brands.