Vauxhall Corsa falls short of fuel economy claims Corsa EcoFlex disappoints in Which? eco test

06 September 2012

The latest fuel economy-focused Vauxhall Corsa is far less efficient than claimed, according to independent fuel economy tests conducted by Which? Car.

The Corsa 1.3 CDTi Eco flex 95bhp with start-stop is Vauxhall’s most economical supermini. However, lab testing by Which? Car experts has revealed that official EU claims simply don’t stack up.

The diesel-powered Corsa EcoFlex grabbed headlines with its claimed extra-urban (out of town) fuel consumption figure of 91.1mpg. That sounds spectacular, but we averaged a more modest 76.4mpg in our tests.

Likewise, the overall 'combined fuel cycle' figure of 85.6mpg could not be matched in testing. We achieved 67.3mpg.

Real-world fuel economy

Our fuel economy tests are more realistic than the official EU tests, as we include warm and cold starts as part of the testing procedure. We also include an element of simulated motorway driving on a rolling road. Here, the Corsa averaged 57.7mpg.

A headline carbon dioxide (CO2) emissions figure of just 88g/km qualifies the Corsa EcoFlex  for free VED (car tax). It’s just as well that taxation isn’t calculated on the actual CO2 output, which was measured by Which? testers at 135g/km.

Under-performing superminis

The Corsa is the latest in a line of superminis tested by Which? Car with super-economical fuel claims that don’t match reality.

For example, the new Peugeot 208 1.4 e-HDi diesel automatic produced a result of just 61.4mpg, missing the claimed average fuel economy figure of 83.1mpg by more than 20mpg. Equally, the Ford Fiesta 1.6 TDCi Econetic returned 62.8mpg (officially 76.3mpg) and the Mini Cooper 1.6 diesel managed 53.3mpg, versus an official 72.4mpg.

Although it didn’t match the official claims, the Corsa 1.3 CDTi EcoFlex 95bhp start-stop is still the second most economical supermini ever tested by Which?

The Volkswagen Polo 1.2 TDI BlueMotion remains our most economical supermini ever, averaging 74.3mpg in lab tests (versus a claimed 80.7mpg).

And the moral is…

Our lab testing highlights the importance of looking not just at the official figures, but at more realistic Which? tested results - provided in every full car test. Be sure to check the hundreds of in-depth car reviews on the Which? Car website before you buy your next car.

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