I had a quick go last night, just out of curiosity. Did 2 runs in my 1.2 65bhp - had my phone and steering wheel in right hand, and gearstick in the left. The first one (which felt the stronger of the 2) resulted in a time of 0.0secs - stoopid phone didn't start timing!
On the second run, still had a pretty decent launch, albeit with a touch of wheelspin, but produced a pathetic time of 15.6secs - I think VW's official time for my car is about 15secs dead. This was performed with just myself in the car (which has done about 2400 miles), although with almost a full tank of petrol (which I didn't realise until after I'd done it, trying to think of excuses for how I got such a crap time!) Might try again when the cars running on fumes.
I know it's rather childish, but I simply had to try this once, before I move onto my next car!