I'm a bit surprised no one has mentioned this yet:
http://news.yahoo.com/s/ap/20060524/.../gm_gas_rebate
Excerpt:
DETROIT - Aiming to capitalize on consumer angst about the high cost of gasoline, General Motors Corp. on Tuesday said it would cap pump prices at $1.99 for customers in California and Florida who buy certain vehicles by July 5.
One hitch to the promotion is that customers must also agree to enroll in the OnStar vehicle diagnostic service, which is free for the first year but after that will cost $16.95 a month. The other is that many of the eligible vehicles are serious gas guzzlers.
The offer is good for 2006 and 2007 model year vehicles. ...