IN THEORY you could drive the latest version of Skoda's Superb from London to Madrid without stopping to refuel - that's a distance of 1,068 miles by the most direct road route.

That, of course, assumes you can achieve the astonishing combined official fuel consumption figure of 76.4mpg which the Czech maker claims for the new GreenLine versions of its big hatchback and estate.

Skoda claims that the newcomer is its most advanced and efficient model to date taking fuel economy and emissions to a new level, with a predicted combined consumption figure of 76.4mpg giving it a theoretical range of more than 1,100 miles on just one tank of fuel.

Its' 1.6-litre four-cylinder diesel engine develops 120PS and has extremely low CO2 emissions of 96g/km for the Hatch and 97g/km for the Estate. Key to the low fuel consumption figures are features such as longer gear ratios, SCR (Selective Catalytic Reduction) and 16-inch, reduced rolling resistance tyres.

To further improve efficiency, the Superb GreenLine has been engineered with a unique aerodynamic package. The chassis sits 15mm lower than the standard Superb, while both the Hatchback and Estate models incorporate tailgate and roof spoilers to efficiently channel air around the rear of the car. As a result of these subtle additions and revisions, both models have lower drag coefficients than the standard models

As with all other Superb models, the GreenLine is equipped with start-stop ignition and brake energy recovery as standard. To meet strict European emission standards, the Superb has two exhaust gas treatment units: an oxidation catalytic converter and a diesel particulate filter.

Nitrogen oxide emissions are reduced through the Superb GreenLine's SCR system, using the reducing agent AdBlue. This synthetically manufactured solution, 32.5% high-purity urea in demineralised water, treats the diesel exhaust gases, reducing nitrogen oxide and saving fuel.

The GreenLine models will be unveiled to the public at the Frankfurt Motor Show in September and will be available in the UK later this year when prices and specifications will be announced.