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So, how was the Tesla Model S P90D’s Ludicrous mode? Hold your horses, I’ve got some other stuff to discuss in this Tesla Model S review first. But yes, this is a P90D with the Ludicrous Speed option. That costs an extra £8,700 (on top of the pre-rebate price of £86,900), and no, it’s not just a software upgrade. If you spec Ludicrous, you get an uprated smart fuse that has its own electronic control unit and separate lithium ion battery pack. Made from Inconel (the same stuff used for F1 exhausts, and we’ve all seen those glow white hot while coping with the heat), the fuse allows maximum current to climb from 1300 to 1500 amps. Is that a lot? It must be, but I don’t really understand amps – what I do understand is 762bhp and 713lb ft. Which is definitely a lot.