How many G's does a car pull under acceleration?

[topless_mx5]

My mate has a G-force recording app on his iPhone. It records the acceleration and deceleration G's during a journey. He has so far managed a maximum of 0.6 G acceleration on his CBR600 whilst nailing it in 2nd.

Is there somewhere I can find out the max G's various cars can pull? Would be interesting to see how it stacks up against supercars etc/.