FYI. I just recevied a notice from Chase that they are discontinuing their Shell gasoline bank cards, which offer rebates for free Shell gasoline.
As of January 26, 2003, Shell "will no longer be participating with Chase in a credit card program." The notice indicates that Chase will substitute some kind of rebate program of their own at that time.

Its not clear from the notice if Shell will be partnering with another card issuer.