Want to save fuel and cut down your CO2 emissions? The DTI has just unveiled the “Act On CO2” initiative to encourage car buyers to purchase more fuel efficient motors. Auto Express has conducted its own research to find Britain’s 100 most economical motors.
The tests were conducted on public roads and take into account traffic conditions, weather, types of road and all the other variables that influence your mpg. Ten classes of cars were tested, from city cars to SUVs and family saloons to MPVs.
Although it emits more CO2 than the majority of the other cars in our superminis top 10, the VW Polo proved the most efficient, coming within eight per cent of matching its official combined figure. It was one of only two cars (the other being a Kia Rio) that managed to break the 50mpg barrier. Only one petrol car broke into the top 10, the Toyota Yaris 1.0 ending up ninth with an economy figure of 44.2mpg.
| Make/Model | Tested MPG | CO2 | |
| 1. Volkswagen Polo 1.9 TDI | 51.9 | 132 | |
| 2. Kia Rio 1.5 CRDi | 51.2 | 121 | |
| 3. Mitsubishi Colt 1.5 DI-D | 47.9 | 126 | |
| 4. Vauxhall Corsa 1.3 CDTI | 47.6 | 124 | |
| 5. Renault Clio 1.5 dCi | 47.5 | 123 | |
| 6. Suzuki Swift 1.3 DDiS | 47.2 | 122 | |
| 7. Peugeot 207 1.6 HDi | 45.3 | 126 | |
| 8. Fiat Grande Punto 1.3 Multijet | 45.2 | 123 | |
| 9. Toyota Yaris 1.0 VVT-I | 44.2 | 127 | |
| 10. Nissan Note 1.5 dCi | 44.1 | 136 |
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