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.
(We will not even think about how much fuel goes into this 162m (530ft)
giga yacht :
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.