They give you a credit card to charge gas on, but when the bill comes it's only for your portion of the cost ($2.99 gallon). There is a limit though, like 10-12K miles per year, and other stipulations to avoid abuse, including only the octane the vehicle requires (allegedly).

We were discussing it on another forum and basically it was the equivalent to a $2000-2500 cash incentive.

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BMWCCA Chapter President, Hawaii Chapter (fmr)
03' X5 4.4i, 02' MCoupe, 99' MCoupe (sold), 88' M3, 01' E39 M5