The Toyota Aygo, Citroen C1 and Peugeot 107 have all been revised for 2012 with 99 g/km CO
emissions and 65.7 mpg combined cycle fuel economy .
In the first significant revisions since the Aygo, C1 and 107 were introduced in 2005, the car also gains a new front-end design, new interior trims and new equipment features.
The Toyota-designed and manufactured three-cylinder 1.0-litre VVT-i petrol engine has had detailed changes.
The all-aluminium unit, which is one of the lightest on the market, tipping the scales at just 67kg, has a revised combustion chamber design that increases combustion efficiency and raises the compression ratio.
Top line performance figures of 67bhp (50kW) at 6,000rpm and 93Nm of torque at 3,600rpm are unchanged.
With the five-speed manual transmission CO 2 emissions fall from 105 to 99 g/km and combined cycle fuel consumption improves from 61.3 to 65.7 mpg.
For versions fitted with Multimode, emissions are down from 106 to 104 g/km and fuel economy rises from 61.4 to 63.8 mpg.
The Aygo also has low insurance costs; the current model occupies the lowest possible UK insurance groups, between 1E and 3E according to version.
The new Aygo will be revealed at the Brussels motor show on 10 January and will go on sale in the UK in March. Specifications, prices and further details of the UK model range will be announced nearer the on-sale date.
The Citroen C1 will also make its world debut at the Brussels Motor Show and will be available in the UK from April 2012.
The Peugeot 107 will be introduced in February 2012 and will cost from £7,995. The 5-door version outsells the 3-door model, with 59.6% v 40.4% of total sales.