The group, Altroconsumo, has accused both companies of sugar-coating efficiency numbers by manipulating lab settings, resulting in figures that do not reflect real-world performance. Controversial practices are said to include stripping cars to lower the curb weight, or over-inflating the tires.
The German company allegedly inflated mpg ratings for its Golf 1.6 TDI by up to 50 percent. The discrepancy is said to have cost buyers an extra 509 euros (~$656 USD) in fuel, extrapolated for an average annual mileage of 15,000 km (9,321 mi).
Fiat is facing a lower damage claim per Panda 1.2 vehicle, with additional fuel costs allegedly adding up to 247 euros (~$318 USD).
“Manufacturers do use tricks to make their cars look more fuel efficient,” said European Consumer Organization director Monique Goyens. “The testing system from the 1970s is broken and urgently needs an update.”
Watchdogs in many countries have called for revised testing guidelines that reduce the mpg gap between automaker estimates and owner experiences. Several companies have been forced to lower fuel economy ratings in the US market. Some, including Ford, have promised to voluntarily compensate buyers.
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