Model BMW 520d SE Engine 1995cc, four cylinders Power 177bhp @ 4000rpm Torque 258 lb ft @ 1750rpm Transmission Six-speed manual [size=10pt]Official fuel/CO2 [/size][color=red]55.4mpg / 136g/km[/color] Performance 0-62mph: 8.3sec Top speed 144mph Road tax band C (£115) Price £27,190 Fuel used on test 10.84 gallons (50.3mpg) Fuel cost £54.19 (diesel) Model Toyota Prius T Spirit Engine 1497cc, four cylinders Electric motor 50kW/67bhp Power 77bhp @ 5000rpm Torque 295 lb ft (motor) 85 lb ft (engine) Transmission CVT automatic [size=10pt]Official fuel/CO2[/size][color=red] 65.7mpg / 104g/km[/color] Performance 0-62mph: 10.9sec Top speed 106mph Road tax band B (£15, alternative fuel) Price £20,677 Fuel used on test 11.34 gallons (48.1mpg) Fuel cost £54.64 (petrol)