does it matter which brand of gas you buy?

Good Morning America did some research to find out if there is any differences in quality between a named-brand gas station and a generic one.

The results: no significant differences. Chances are they buy the gas from the same refinery and at most have different levels of detergent. These days EPA require that all fuel has a minimum level of detergent so it does not matter you buy it you will get it.

More details here.