Power to weight

[Andy.bn]

Hi there, I'm hoping someone can enlighten me a little on the following scenario of comparing the performance of 2 standard, modern city cars. They are the Hyundai i10 1.2 (which is my current car for the past 3 years) Vs the Volkswagen up! 1.0 tsi (which I'm considering for my next vehicle).
My Hyundai has a claimed 86bhp and weighs 941kg giving a power to weight ratio of 91.4 bhp/tonne by my calculations. The VW up tsi as a five door weighs 1027kg and comes with 89bhp, giving a power to weight of 86.7bhp/tonne.

The mystery is that the up is claimed to be some 2.4 seconds quicker from 0 to 60mph, despite an inferior power to weight ratio, so how is this possible? I considered a difference in gear ratios but both cars I believe are geared fairly tall for economy. Would it be just down to the characteristics of the turbo engine? It seems to defy the laws of physics!

[Andy.bn]

Hi everyone, thanks for your range of interesting replies. For me I think the signicant additional torque of the turbo engine (~ 30lbs ft Extra) must have a lot to do with it. Other factors such as weight distribution, traction and gearing are probably pretty similar.
I have driven the Up tsi and it's certainly pretty punchy in the 2000 - 4000 rpm area, way more than I'm used to, pulling well from around 1500.