The Burlingame A&A is notorious for being the one of the cheapest -- if not the cheapest -- places to fill up between SF and SV. In this case, it's likely that the Chevron literally across the street just decided it's not worth playing that game, hoping instead to appeal to the crowd who wonders if the cheap competitor is actually up to par.

The fact that the Chevron gets any business at all seems to validate this strategy at first blush.