MITSUBISHI has hit back at criticism that its revolutionary GDI engine installed in the Carisma is not as fuel efficient as it claims. Some motoring magazines and newspapers - including Fleet NewsNet - have struggled to repeat the fuel economy performance claimed by Mitsubishi.

But as the company embarks on installing a range of GDI engines - from 1.5 litre to V8 4.5 litre - in its vehicles a company spokesman said the GDI offered superb fuel economy and huge amounts of power with motorists who opted for power losing out on the fuel economy. 'There is a technique to driving the GDI engine,' said spokesman David Miles. 'The engine offers 10% more power and is 20% more fuel efficient than a traditional 1.8-litre petrol engine. But if you want to use the 10% power then don't expect a 20% increase in fuel economy.'

In recent weeks Mitsubishi has been holding an economy drive for corporate customers across Britain and the company claims drivers have typically achieved 55 mpg. Two Fleet NewsNet staff drivers have achieved 38.1 mpg and 42.6 mpg along all types of roads.