After a winter's afternoon spent tear-assing around in Poole Harbour, a thoroughly frozen Mrs F. sank into the SL55's heated seats, switched on the massage button and drifted off into the arms of Morpheous. I immediately began the Sleep Test. How fast could I drive without waking my passenger?
Is that the sound of eyebrows arching? Many enthusiasts will insist that the best way to test a 493bhp automobile is to grab it by the scruff of the neck and thrash it to an inch of its life. Please! Have a little respect. The SL55 may be Mercedes' fastest ever production automobile, but it is not a rally-bred Subaru. It's a Benz. It's a big, heavy, luxury car. Tradition dictates that the SL55's driver displays a certain amount of 'decorum'. Progress should be rapid, yet safe and effortless. Hence the Sleep Test.