I'm a first time poster in MilesBuzz so I hope I'm asking my question in the right place...

I might be leaving Vancouver and driving across the US to take up a new job in Toronto. I was wondering if there are any reward programs run by gas stations that I could join that would get me some form of reward for my trip. I figure I'll spend around $300 in fuel. Obviously it would need to be a station that exists along my route. I'm planning to drive down to Seattle, across I-90 through South Dakota and into the Chicago area, and then along I-94 and I-69, crossing the border at Port Huron. I know I'm not spending all that much, but I figured rather than going unrewarded that I could join something that might get me a free soda or snack at the end of the trip. Any ideas?