This tip from reader "kara17" is a good one, but only if you have unwavering discipline:
We put absolutely everything on credit cards with cashback rewards. (Warning: This obviously doesn't work if you don't pay your full balance every month. If you're paying 15% interest, a 5% cashback reward isn't doing much good.) We both have cards (from different companies -- one from Discover and one from Citi) with 5% cash back on gas, 3% cash back on groceries, and 1% cash back on all other purchases. There is a limit on how much you can get 5% cash back on (I think ours is $2,000 a year), so once we hit that limit, we switch to using the other card we have. These percentages may not seem high, but if you put everything on the cards, the cashback savings really add up.
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