Study outlines potential of plug-in hybrids

A basic comparison of fuel consumption produced mean values of:
Basic conventional: 6.6l/100km (35.6mpg US)
Hybrid (HEV): 4.69l/100km (50.2mpg US)
Split 4 kWh: 3.27l/100km (71.9mpg US)
Split 8 kWh: 2.32l/100km (101.4mpg US)
Series 12 kWh: 1.50l/100km (156.8mpg US)
Series 16 kWh: 1.23l/100km (191.2mpg US)
Source: thegreencarwebsite.co.uk