Our real-world fuel economy tests have highlighted that the Vauxhall Corsa 1.3 CDTi (95) EcoFlex falls drastically short of Vauxhall’s claimed fuel economy figure. And the Corsa isn’t the only culprit…
Official fuel economy figures for the Vauxhall Corsa have been getting more and more impressive over the last decade. The current ‘eco’ model, the catchily-named diesel 1.3 CDTi (95) EcoFlex diesel Start Stop S is claimed to achieve a remarkable 85.6mpg. However, in our more realistic tests it only achieved 65.7mpg, a drop of 23% from the Vauxhall’s figure.
False economy: the real cost of fuel
For an average driver covering 12,000 miles every year, the difference between the claimed figure and reality would cost you an extra £265.39 per year in fuel*. And our testing reveals that the gap between claimed and achievable fuel economy is growing.
The first diesel version of the current Corsa that went through our lab returned 94% of its claimed fuel economy figure – a 3.8mpg shortfall. Over 12,000 miles this would cost you an extra £82*. Every subsequent diesel Corsa to go through our labs has fallen further short of the claimed figure, with the latest 1.3 CDTi (95) EcoFlex Start Stop achieving just 77% of the claim.
Consequently, although economy has apparently increased by 24.2mpg between these two models, the real figure has gone up by just 8.1mpg – barely a third of the claimed increase. Read our full review of the Vauxhall Corsa to see all our tested fuel economy figures.
Fuel economy figures you can trust
Our test lab has revealed that the Corsa isn’t the only car with disappointing fuel economy figures.
Even the most economical car we’ve ever tested, the Toyota Prius Plug-In, which returned 83.1mpg in our tests, was a huge 51mpg short. That’s less than 62% of the ‘official’ EU test economy figure.
Here’s where our in depth car reviews can help – we test every car in conditions that are both representative of real driving and directly comparable. Our comprehensive car reviews include our fuel economy figures alongside manufacturers’ claims to give you a good idea of what your fuel costs will be.
Try Which? for £1 to read our full lab test review for the Vauxhall Corsa
*Using average UK diesel price of £1.3767 for 5 November 2013 (source: Petrolprices.com)