Ever Rent Cars? Do You get "Upgraded"?

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http://www.usatoday.com/travel/news/2008-08-04-small-rental-cars-downsize_N.htm?csp=Travel I read this article,and the part about the Guy who booked a Smaller car,and got upgraded to a Hummer,with the result his fuel bill equalled his rental cost! Has anything like this happened to You recently,or before? Are Rental places running out of economical cars with current fuel prices the way they are? Would you take a Thirstier car than the one You booked,or go elsewhere if You could? (There's a Gas Station Sign Avatar pic on there that I like!) Thanks for responses!