In a wide-ranging package of green energy measures the EU has set itself the target of increasing energy efficiency by 20% by 2020.

BBC: EU auditors criticise energy efficiency projects

More than half of the energy and climate change policy costs in household bills are spent on measures to target the fuel poor and energy efficiency.

BBC: Energy policies 'reduce bill rises'

"Being able to provide our customers with the best overall efficiency of any retail EV has always been a key target for the Spark EV engineering team, " said Pam Fletcher, GM executive chief engineer for electrified vehicles.

ENGADGET: Chevy Spark EV rated most efficient retail car with 82-mile range, 119 MPGe