BMW exhibits the ECO-friendly concepts i3 and i8 at the 2011 Frankfurt Motor Show. Both vehicles will set a new bars in turn of efficiency.

The small i3 Concept is a four-seater city car with 5 doors, which is powered only by electric motor, but with astonishing power – 170PS (125 kW) and 250Nm (184 lb-ft) of torque. There is a lithium-ion battery package delivering up to 160 km (100 miles) range. 0 to 100 km/h in 7.9 seconds and top speed of 150 km/h (93 mph). The overall weight of the vehicle is 1250 kg (2755 lbs). BMW i3 is perfect for everyday driving with its range and once the battery is depleted, it can be recharged in just 6 hours to 100%.

The i8 Concept is completely different vehicle. It comes with a turbocharged 1.5-liter three-cylinder petrol combined with an electric motor. The total power is 353PS (260 kW) and 550Nm (406 lb-ft) of torque. 0 to 100 km/h in 4.6 seconds and top speed of 250 km/h (155 mph). The curb weight of the vehicle is 1480kg, so the results are impressive.

The i8 can go on electricity alone up to 35 km (20 miles), which means that you'll need just 2.7 liters of fuel per 100 km and the CO2 emission are as low as 66 g/km.

BMW i8 Concept Rear

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Source: BMW