That really sounds like a spoof.

>Here is the transcript (act 4 of last night's show):
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>We have a special guest tonight who is here to make an exciting announcement. Dave welcomes former 7-Eleven President and current CEO of ExxonMobil, Mr. Jim Keyes.
>Jim Keyes enters and stands center stage.
>KEYES: “Thanks, Dave, and good evening, folks. We at ExxonMobil know you want relief at the gas pump. Well, this holiday weekend, you’ll get exactly that, thanks to a promotion called the Late Show Free Gas Giveaway!
>All across America, Friday through Monday, pull into any ExxonMobil station and say, ‘This tank’s on Dave!’ You’ll get up to twenty gallons of ExxonMobil gasoline free ---- thanks to that man right there, David Letterman!” (applause)
>“That would be incredible enough, but there’s more. Dave and ExxonMobil keep your cool this summer with a free cardboard sunshade for your windshield! Plus, one lucky motorist will win a pair of VIP passes to the Hollywood premiere of the summer blockbuster film, ‘The Incredible Hulk.’
>So, visit your local ExxonMobil station this weekend. Sounds like this summer’s gonna be a hot one, am I right, folks?
>Thanks, Dave . . . and tanks, Dave. Happy Motoring, everyone!”
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>The ExxonMobil CEO exits. Paul has doubt. He asks Dave, “Was that really the CEO of ExxonMobil?”
>Dave checks his bluecard and says, “That’s what it says on this card.”
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>If it was a spoof, it sure is creating a mess at the pump...
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>http://www.cbs.com/latenight/lateshow/wahoo/index/php/20080521.phtml