Originally Posted by murphman

yeah i have a discount valero station by my house. I use to only get my gas from there in my previous car. I switched to Exxon across the street one day because i was on that side of the road and noticed in that fill up my mpg spiked 2-3 mpg. Never went back to Valero and my mpg stayed at the new mpg. Guess there was a reason it is a "discounted" gas station, shitty gas.