New research again casts doubt on official, government-sanctioned fuel economy figures.
New car buyers who trust official MPG stats will pay an average of £1,000 more than they expect on fuel over a three-year period, according to What Car? True MPG test results.
That is because the official figures are achieved under laboratory conditions that can rarely be replicated in the real world.
Since launching True MPG two years ago, What Car? has tested almost 400 cars in real-world conditions using cutting-edge test equipment, achieving economy figures that are an average of 19% lower than the government figures.
Most efficient cars tested by What Car? True MPG to date
Vehicle True MPG Test Official MPG
1 Kia Rio 1.1 CRDi EcoDynamics 70.6mpg 88.3mpg
2 Citroen C3 1.4 e-HDi Airdream EG 70.3mpg 83.0mpg
3 Honda Civic 1.6 i-DTEC 66.4mpg 78.5mpg
4 Ford Fiesta 1.6 TDCi ECOnetic 62.1mpg 78.5mpg
5 Honda Civic Tourer 1.6 i-DTEC 61.8mpg 72.4mpg
6 Dacia Sandero 1.5 dCi 90 61.7mpg 74.3mpg
7 Vauxhall Corsa 1.3 CDTi Ecoflex S 61.4mpg 85.6mpg
8 Hyundai i20 1.1 CRDi 61.1mpg 74.3mpg
9 Fiat Panda 1.3 Multijet 61.0mpg 72.4mpg
10 Renault Clio 1.5 dCi 90 60.1mpg 78.5mpg