I see that Citgo is offering a rewards program for every $20+ you spend there. You are able to link multiple Visa branded CCs to this. Here's the link:
http://www.citgogoodrewards.com/I also got a notice from my Chase Freedom Visa card that the new quarterly bonuses include gas. I linked my Freedom to Citgo for maximum bonuses. My gas tank is pretty empty now so I'll get exactly $20.00 in gas every day on the way home, racking up both Citgo bonuses and Freedom points. Excellent!