Sticker Shock

I just put some gas in the tank-- $3.90/gallon! Egads. I don't drive in the city, so I don't fill the tank frequently; I just happened to kill some time while moving alternate side parking this morning. So I'm pumping gas and staring in panic at the numbers by the dollar sign flipping in rapid succession, and my eyes drift down to a receptacle for BP/Amoco gas card applications. 10% rebate first 60 days, 5% thereafter. Is it time to apply for another card?

This summer M and I will be driving to the northern reaches of Maine for a couple weeks, then down to Cape Cod for a week, and back to NYC. Plus there's a round trip NYC-Boston trip, maybe a jaunt down the Jersey Shore- it's a busy summer for our little car. With absolutely killer prices prices at the pump, I think I'll look into credit reward cards that are good for road trips. I'll post my findings, and any suggestions in the meantime would be great.