New Delhi, Sept. 11 -- To stem hefty reliance on fossil fuels, the government has rolled out E20 for petrol already, but its experiments of blending 10 per cent ethanol with diesel turned out unsuccessful and now the experiments are being carried out with isobutanol, Union Minister for Road Transport and Highways, Nitin Gadkari, said on Thursday.

"Experiments were carried out to blend 10 per cent ethanol with diesel, but they turned out to be unsuccessful. Now efforts are being made to blend diesel with isobutanol, which is a derivative of ethanol," he said while addressing the India Sugar & Bio-Energy Conference.

E20 is a government mandate in which 20 per cent ethanol--an alcohol primarily derived from sugarcane and grains like maize ...