Toyota has never been shy about promoting the Yaris as a fuel-efficient vehicle, and the 2010 Yaris with Toyota Optimal Drive is getting the same treatment. Toyota is comparing the small hatch to its competitors – the Ford Fiesta, Volkswagen Polo, Honda Jazz and Vauxhall Corsa – and, unsurprisingly, tells us that it wins in both fuel economy and CO2 emissions (see Toyota's chart after the jump). Yes, we know that those two numbers are connected: if you burn less fuel, you emit less carbon dioxide.
In any case, the Optimal Drive Yaris features start-stop technology that shuts the engine off when the car isn't moving. This helps all versions of the small car emit fewer than 120 grams of CO2 per kilometer, an important level to reach in the UK, where it means lowered taxes. The most efficient Yaris gets 46 mph (U.S.). The entry-level Yaris – the three-door 1.0 VVT-i 5MT model – starts at £10,256. More details after the jump.