The race to produce the most fuel-efficient passenger car is on in earnest.
The Geneva Motor Show has been used by several manufacturers to highlight small, fuel-sipping vehicles designed mainly for city use.
One of the more practical at the show was the five-seater Audi A3 e-tron.
Using plug-in hybrid technology, the five-door hatch has an official fuel consumption figure of just 1.5L/100km from its 150kW, 1.4-litre, four-cylinder engine that can propel the car from 0-100km/h in 7.6secs and take it to a top speed of 222km/h.
Its efficiency gains are created by a clutch that links the TFSI engine to a 75kW disc-shaped electric motor that is integrated into a six-speed e-S tronic transmission.
The two power plants complement one another with the electric motor delivering its peak torque from start to about 2000rpm when the TFSI's engine starts to make a contribution.
The e-tron can be driven with just the combustion engine, just the electric motor or in combination.
It can be driven in pure electric mode for up to 50km and at speeds of up to 130km/h.Audi is yet to reveal when it will go into production.
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