Telegraph: Mitsubishi, Smart, Telsa, Nissan, Renault,Toyota, GM and Ford are planning to unveil various plug-in hyrid and electric cars by 2011 when the incentives kick in. Not all electric cars are expected to be equal under the reported £250m scheme. Experts believe a sliding scale of incentives will be set on the basis of a car’s CO2 emissions – from zero to low emission and a ceiling set on those that qualify. Green Clean Car, the website which offers a guide green motoring, reports …