Once my office moved, and gas prices started skyrocketing, I started stopping at a newly converted Valero (it used to be a ridiculously overpriced Sunoco Station). It wasn't generally that busy, and it was cheaper than other station (never went over the $4 mark fortunately), but my Vibe did NOT like the gas at all. Thankfully, I had no major issues, but it didn't run as smoothly as it normally did.
One time I forgot to fill up at a Sunoco closer to home and went on a drive. I embarked upon a Wawa because my gas tank was way too low, and filled up there as normal. I was pleasantly surprised to see I was getting more miles to the tank than ever...at least with my daily commute. Also the Vibe runs as smooth as silk again. I tried the local Wawa by my office complex, and continued to get the same results. For the sake of convenience, I went back to Sunoco, but couldn't duplicate the results with Wawa gas.
Apparently my Vibe and I really were meant for each other; just as I love Wawa (especially the coffee), Streak loves its gasoline. So since then I've been using Wawa gasoline when feasible. I do wonder, though...
Could the fact that Wawa gas stations always seem to be insanely busy have something to do with the quality? Also, apparently Wawa "guarantees" its gasoline: http://www.wawa.com/wawaweb/Gas.aspx
Anyone else have any experience with Wawa gasoline? I'm pretty pleased, quite honestly, and am surprised that it has such a bad rumor. My only frustration is dealing with all of these cars to get to the pump, but I love getting coupons with the receipts (when I remember to use them! )