(MONEY Magazine) – Three months ago, when we praised the Shell Gold MasterCard--which rewards you with free gas--as one of the best cards for big spenders, one drawback we noted was that heavy chargers could max out on rebates fast. Forget that caveat. In June, issuer Chase did away with the rebate cap that kicked in once you spent $3,500 on anything other than gas. Plus, the bank boosted the rate at which you earn free gas from 3% to 5% of what you spend at Shell. Even though the rebate on non-Shell purchases was cut from 2% to 1%, serious drivers should still come out ahead. --S.R.