What Car?'s True MPG tests are conducted in a laboratory under strictly controlled conditions, but based on a real route that takes in town, rural and motorway driving.
Below we take a look at all of the cars we've tested in the last month, revealing the fuel economy you can really expect them to deliver on UK roads.
Audi A4 Allroad 3.0 TDI 218
Official fuel economy: 54.2mpg; True MPG: 38.8mpg; Shortfall: 28.5%
Audi Q7 3.0 TDI 272
Official fuel economy: 47.9mpg; True MPG: 34.0mpg; Shortfall: 29.0%
Citroën C3 1.2 PureTech
Official fuel economy: 57.6mpg; True MPG: 48.8mpg; Shortfall: 15.2%
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