Costco "Premium" Gas is Bad
After experimenting for several months, I found that after every time I get Costco premium gas (91 octane), I immediately have performance issues.
My car was running perfectly today until I filled up with Costco gas. I had 20mi until empty, I filled up, jumped on the freeway a few miles away, got on the gas, and the power was not there and the car started to putter and would barely accelerate. This has happened to me about 10 times now and only after I get gas from Costco. If I get gas from anywhere else, like BP or Mobile, my car runs fine.
It is without doubt true that Costco premium gas can give you performance problems. If you drive a BMW with a high performance engine (I have a N54), do not get Costco gas. Pay the extra and get good gas from elsewhere.
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