:cornut: There is a thread around here somewhere that said that Costco gas is one of the worst that you can buy. I have no knowledge of Costco gas myself however. Jason
Costco buys gas on the spot market and buys the least expensive brand on that day. Is that a bad thing, for your MINI, probably, it doesn't have an additive package that Top Tier brands have. For your SUV, probably not. All gas has to meet a minimum spec. It all comes from the same depot in the region, the only difference being the additive package added when the tanker is being filled. Another thing is that Costco sells a lot of gas, their tanks are filled often. It's fresh gas as opposed to the small brand name station that's 0.50 gal more down the street. For my SUV (not that I have one) I'd buy Costco gas if I was a member. For my MINI, not so much.
Costco does have an additive package, comparable to top tier gas, they just don't want to pay for the top tier gas approval. There is a big above ground tank at Costco stations, it contains the additive package and it is added right at the gas station.. How do I know? I asked! Dave