Why people do that

[tw]

Missing from that list are many discount brand gasolines including those that have the most and busiest pumps (ie Sheets, Wawa).

Those 'acceptable' gasolines have been known for decades. For example, in 1980, BMW only listed Chevron, Amoco. Exxon, Shell, and Texaco as acceptable. That was a national survey. Sunoco was a regional brand. It may have also belonged on that list over 35 years ago. But then I did not actually test Sunoco - so I cannot say with certainty.

In order to maximize their EPA mileage, GM required testing only with Chevron. Ever wonder why so many GM owners had trouble duplicating those EPA numbers? Discount gas.

What happens when using just one tank of a discount brand? My Accords would drop from 32 MPG to about 24 or 25 MPG. In some cases, it took up to four tanks of the good stuff to undo that damage.

At current prices, add maybe 24 cents per gallon to their posted price. That is the real price of discount gasoline.