Fiat will show two environment-friendly concepts in Geneva.
The 500 Aria is fitted with a 1.3-litre turbocharged diesel engine with particulate filter that emits 98g/km of CO2. It has a clutchless manual transmission and start-stop technology. Fuel consumption is reduced by up to 10% in city driving.
Inside the car is made of recycled and renewable materials. The flooring is from used tyres, seats from recycled leather and other parts are made from recycled thermoplastic materials and natural fibres.
The downsized turbocharged engine and stop-start technology are likely find their way into series production, but the interior is described as only a demonstration of what is possible.
Future 500 models include a cabriolet version, according to Auto Express magazine, although not before 2009.

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By GlobalDataFiat will also show a Panda Aria concept. It uses a dual-fuel two cylinder turbocharged engine that can be run on petrol or natural gas.
Last year, at the UK launch of the Bravo hatchback, Fiat global marketing director Steve Norman said the automaker was developing a twin cylinder engine that turbocharged to 90-110bhp. Branded Multiair, the new 900cc unit features measurement of both air supply and fuel.