Amex Simply Business just put a limit on I believe it was 75 gallons or cash equivalent (how they would know that I don't know) it's only for auto gas but they can't tell that either. I get the rebate on truck fuel.
Amex Blue Cash has 5% back but you need to spend I think it is $6500 to start to earn the 5% cash back on fuel and 1.5% on all other purchases. Before the $6500 I think you earn 1%. This is supposed to be for personal purchases only but they can't tell. And this is good up to $50,000 in spending
They have a new card Amex Plum which gives you 2% back on all purchases if you pay your bill within the first 10 days and you spend over $5,000
Chase has a business card that gives you 3% back on fuel and restaurant purchases and a few other I think. I only use this for food purchases and my daily iced coffee (or two
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Double check everything I just said as all of this is off the top of my head but if you want to find a good credit card go here
http://www.fatwallet.com/t/52/711457/
Actually that's what I've been doing for the last couple of hours as I don't feel like breaking up my fuel purchases and I don't want to mix personal with business so if I start using Amex Blue Cash then I need to find another card for Mrs. Merrick. Use to be plenty of them but they are getting harder and harder to find. A good one still around is by PenFed which is the Pentagon Federal Credit Union which has good rates for a lot of different things.