Just think of poor Larry Ellison, his boat takes about 160000(!) gallons of fuel, at the Dutch price of $1.90 a liter or $7,22 a gallon (3.8ltr) makes for a hefty bill of $1.155.200.
That is money he wont be able to spend on his new 90ft AC multimonster.
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(We will not even think about how much fuel goes into this 162m (530ft) giga yacht :

[Linked Image]

About the autobahn speeds, the place where I drive on a regular basis is so quiet that I can set cruise control at 185km/h (115mph) (My car wont go any faster!) and just leave it for an hour and a half and maybe pass a few cars and the occasional truck now and then.