Its not fake... The Mythbusters used pathetic puny little jet engines... In this clip you see a definite answer to the question if it is possible to blow a car out of the way with a jet.
On
BBC's Top Gear, a couple weeks ago, they took 2 cars, one some sort of Ford, the other a Citroen 2CV. They drove them behind a 747 which had 2 engines at full power... both cars were completely blown away, they tumbled and were smashed to bits, much like you see in this video.
There are bittorrent downloads available for this show of the 18th of July. Just Google it.
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typo in the title