Arvind KejriwalNEW DELHI: Aam Aadmi Party (AAP) supremo Arvind Kejriwal on Wednesday wrote to 29 automobile manufacturers, seeking a written clarification on the impact of E20 ethanol-blended fuel on vehicle mileage and engines safety and asked them to respond within seven days.Addressing a press conference, Kejriwal said he had sent separate letters to Maruti Suzuki India, Toyota Kirloskar Motor and Hero MotoCorp, while the remaining 26 companies received a different communication seeking their position on E20 fuel."There are 29 automobile manufacturers. The letters have already been prepared and are being dispatched while this press conference is underway," Kejriwal said.Kejriwal said the three companies had stated during the Centre's July 4 press conference that E20 fuel could be safely