"Air power would be used solely for city driving, automatically activated below 43mph," said Peugeot in a press release.

The system combines a gasoline engine with an air engine, which is used at speeds under 70mph.
This enables it to run on petrol or air or a combination of both.

According to the company, the car could achieve an average of 117 miles a gallon by 2020. The new engine system is a breakthrough for hybrid cars because expensive batteries would no longer be needed.

Cars fitted with Hybrid Air system would be cheaper to buy than current hybrid models. Drivers never run the risk of running out of compressed air because the car would have a sophisticated device that ensures it replenishes itself automatically, added Peugeot.