This is how much your car REALLY does to the gallon: What Car?'s new true MPG test finds current fuel economy claims exaggerate by 30%

September 7, 2016

  • Realistic test finds one car is 37.8% off the claimed miles per gallon claim

  • Vauxhall Astra 1.6-litre diesel is the most efficient car tested so far

  • But it's still 32.2% shy of the 83.1mpg Vauxhall tells you it will do

  • Separate test also finds a 30% difference in achievable fuel economy

  • An Aston Martin was the only car in the last 2 years to better its mpg claim











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