What Car? has launched a True MPG service which it claims will provide motorists with more accurate information on real world fuel consumption than the combined figures published by carmakers.
The online tool covers thousands of new cars on sale in the UK.
What Car? tests the vehicles using a portable emissions-measurement system when the engines have reached normal operating temperature. The vehicles are then driven by two engineers over a variety of roads including motorway, A- and B-roads, and through towns and villages. The data from the testing considers driving style, changes in altitude, ambient temperature and humidity and engine temperature.
Typical What Car? True MPG ratings
| Model | GOVT MPG | TRUE MPG |
| Alfa Romeo Giulietta 2.0 JTDm 140 Lusso | 62.8mpg | 58.9mpg |
| Audi A1 1.4 TFSi Sport | 53.3mpg | 46.9mpg |
| Audi A4 2.0 TDIe 136 SE Technik | 65.7mpg | 54.3mpg |
| Audi A6 2.0 TDi SE | 57.6mpg | 56.1mpg |
| Audi A7 Sportback 3.0 TDI 245 quattro SE | 47.9mpg | 43.4mpg |
| BMW 118d SE | 62.8mpg | 47.2mpg |
| BMW 320d Sport | 61.4mpg | 54.8mpg |
| BMW X1 sDrive20d Efficient Dynamics | 62.8mpg | 50.8mpg |
| BMW X3 xDrive20d M Sport | 50.4mpg | 42.2mpg |
| BMW 520d SE Efficient Dynamics | 62.8mpg | 54.5mpg |
| Fiat 500 1.2 Lounge | 58.9mpg | 44.3mpg |
| Ford Fiesta 1.25 82 Zetec | 50.4mpg | 42.3mpg |
| Ford Fiesta 1.6 TDCi Econetic | 78.5mpg | 62.1mpg |
| Ford Focus 1.6 TDCi 115 Zetec | 67.3mpg | 43.1mpg |
| Ford Focus 1.6T 150 Ecoboost Titanium | 47.1mpg | 35.1mpg |
| Ford Focus Estate 1.6 TDCi 115 Titanium | 67.3mpg | 42.3mpg |
| Ford Mondeo 2.0 TDCi 140 Zetec | 53.3mpg | 42.8mpg |
| Ford S-Max 1.6T 160 Ecoboost Titanium S/S | 40.4mpg | 29.8mpg |
| Ford S-Max 2.2 TDCi 200 Titanium | 42.8mpg | 39.6mpg |
| Honda Civic 2.2 i-DTEC ES | 67.3mpg | 59.0mpg |
| Hyundai i10 1.2 Classic | 61.4mpg | 46.5mpg |
| Hyundai i30 1.6 CRDi Active | 76.3mpg | 54.4mpg |
| Hyundai i40 Tourer 1.7 CRDi 136 Blue Drive Style | 62.8mpg | 53.5mpg |
| Hyundai Santa Fe 2.2 CRDi Style five-seat | 41.5mpg | 40.4mpg |
| Jaguar XF 2.2D 190 Luxury | 52.3mpg | 42.1mpg |
| Jaguar XK Convertible 5.0 V8 | 25.2mpg | 24.9mpg |
| Kia Optima 1.7 CRDi 1 | 57.6mpg | 49.3mpg |
| Kia Picanto 1.0 2 | 67.3mpg | 41.2mpg |
| Kia Rio 1.25 1 Air | 56.5mpg | 46.4mpg |
| Kia Rio 1.1 CRDi Ecodynamics 1 | 88.3mpg | 70.6mpg |
| Kia Sportage 1.6 GDi 1 2WD | 44.1mpg | 40.7mpg |
| Land Rover Discovery 3.0 SDV6 HSE | 32.2mpg | 30.7mpg |
| Land Rover Range Rover Evoque 2.2 SD4 190 Prestige | 43.5mpg | 36.4mpg |
| Mazda MX-5 1.8i SE | 39.8mpg | 35.1mpg |
| Mercedes-Benz C220 CDI Blue Efficiency Elegance | 64.2mpg | 57.5mpg |
| Mercedes-Benz S350L CDI Bluetec | 36.7mpg | 37.3mpg |
| Mini 1.6D Cooper | 74.3mpg | 52.5mpg |
| Mini Convertible 1.6 Cooper | 49.6mpg | 40.1mpg |
| Mini Countryman 1.6T Cooper S All4 | 42.2mpg | 38.6mpg |
| Nissan Micra 1.2 DIG-S Shiro | 65.7mpg | 44.1mpg |
| Nissan Note 1.4 N-tec+ | 47.9mpg | 44.5mpg |
| Nissan Qashqai 1.6 dCi N-tec 2WD (without stop-start) | 57.6mpg | 49.5mpg |
| Peugeot 107 1.0 Allure | 65.7mpg | 52.3mpg |
| Peugeot 3008 1.6 THP 156 Active | 38.7mpg | 36.5mpg |
| Peugeot 3008 Hybrid4 104g | 70.6mpg | 46.0mpg |
| Peugeot 5008 1.6 HDi 112 Access | 51.4mpg | 36.9mpg |
| Renault Grand Scénic 1.6 dCi 130 Dynamique S/S | 64.2mpg | 48.6mpg |
| Seat Alhambra 2.0 TDI 170 SE | 48.7mpg | 44.1mpg |
| Toyota Avensis 2.2 D-CAT 150 T4 auto | 45.6mpg | 43.3mpg |
| Toyota Prius 1.8 VVT-i T Spirit (pre-face-lift) | 70.6mpg | 52.2mpg |
| Vauxhall Corsa 1.2i VVT Ecoflex SXi S/S 5dr | 51.4mpg | 50.8mpg |
| Vauxhall Zafira Tourer 2.0 CDTi 165 SE S/S | 54.3mpg | 52.4mpg |
| VW Eos 2.0 TDI 140 Bluemotion Tech Exclusive DSG | 53.3mpg | 50.7mpg |
| VW Golf 1.4 TSi Match | 45.6mpg | 43.3mpg |
| VW Golf 1.6 TDI 105 Bluemotion | 74.3mpg | 51.8mpg |
| VW CC 2.0 TDI 170 Bluemotion Technology GT DSG | 51.4mpg | 50.3mpg |
| VW Jetta 1.6 TDI 105 Bluemotion Technology S | 67.3mpg | 48.4mpg |
| VW Scirocco 2.0 Bluemotion Technology TDi 140 PS | 62.8mpg | 49.6mpg |
| VW Passat Estate 2.0 TDI 140 Bluemotion Tech SE | 60.1mpg | 54.8mpg |
| VW Polo 1.4 85 Match | 47.9mpg | 34.2mpg |
| VW Touran 1.6 TDI 105 S | 55.4mpg | 47.2mpg |
| VW Up 1.0 75 Black | 60.1mpg | 47.1mpg |
| Volvo S60 1.6 DRIVe 115 SE S/S | 65.7mpg | 50.1mpg |
| Volvo XC60 2.0 D3 DRIVe ES 2WD S/S | 49.6mpg | 38.3mpg |
