Frankfurt motor show 2013: Peugeot 208 FE Project partners Peugeot and Total Numerous put the gains down to a 25 per cent improvement in the aerodynamic, overall weight reduced by 20 per cent, a 10 per cent improvement in economy by close attention to the drivetrain, and recovery of 25 per cent of the energy over one drive cycle thanks to the hybrid system. The 208 FE (for 'fun' and 'efficient') features a conventional petrol engine boosted by the electric motor that Peugeot Sport had initially intended to part power its diesel-electric hybrid Le Mans racer. A 90-cell battery beneath the rear seat supplies this and is charged by energy recovered from braking. The racing engineers has designed a new cylinder head for the 1.0-litre, 68bhp petrol engine and worked on limiting friction. The project leader Christophe Mary said: "We've reduced emissions by 10g/km simply with those improvements." Part of the weight-saving includes revised suspension, with glass-fibre blades replacing springs, lower wishbones and anti-roll bars, while some metal panels at the rear were replaced with carbon-fibre items. The overall result is 200kg shaved from the weight of a regular 208. Visually, the biggest visual change is to the rear bodywork. This has been made narrower with a blunt tail in order to improve aerodynamic efficiency. Mary added: "It's not so illogical using us. To make a truly efficient road car there are four main areas to look at: tyre rolling resistance, aerodynamics, engine efficiency and energy recovery plus weight. They're all areas we investigate when we're developing a racing car.