It's worth a note that in their 2008 season, Top Gear did a supercar test of the McLaren SLR, the Aston Martin DBS, the Audi R8 4.2, the Ferrari 599 and the Lamborghini Murcielago. Each was given a gallon (Imperial, not US) of fuel and they had a race around the track.
The 599 ran out in 1.7 miles, followed by the Aston (no distance given), the SLR (no distance given), the Murcielago (4.1 miles) and the R8 won with 5 miles. This would give equivalent trackwork ranges for the cars of 39 miles (Ferrari 599), 30-70 miles (Aston Martin DBS), 38-84 miles (McLaren SLR), 90 miles (Lamborghini Murcielago), 99 miles (Audi R8 4.2). And I recall Clarkson's own Ford GT would manage 75 miles at speed out of a tank - with Dunsfold being 76 miles from his own home... All of these numbers are well below manufacturer economy ratings and at no point in the episode is it mentioned that hard track driving results in poorer economy figures, presumably because this is assumed knowledge. That the Tesla didn't get the manufacturer range rating during trackwork is unsurprising - and that it wasn't mentioned that trackwork leads to poor economy ratings isn't bias against Tesla, because it wasn't mentioned for Mercedes, Audi, Aston Martin, Lamborghini or Ferrari either - and in fact the reduction in range for the Tesla (55 miles compared to 211 for normal use - a 74% reduction) is much better than for some of the supercars (82-92% for the SLR, 76-90% for the DBS, 89% for the Ferrari 599) and ballpark for the others (70% for the Murcielago, 75% for the R8).
In the same episode, they pushed a Prius to ten laps of the track at speed and found it averaged 17.2 mpg - while a BMW M3 going around the same track at the same time at the same speed managed 19.4 mpg. The stated point here wasn't that the Prius is rubbish, or gets far below manufacturer economy, or that the M3 is more economical - none of which are true - but that how you drive has a significant effect on fuel economy. The Prius gets poorer fuel economy when pushed to its limits on a track than a V8 BMW using very little of its potential despite them being driven at the same speed. It wouldn't take much reduction in pace to see the Prius overtake the M3 in economy.