Mumbai, Feb. 22 -- Maruti Suzuki India Ltd and Mahindra and Mahindra Ltd are working on plans to gradually reduce dependence on diesel vehicles as regulations and market sentiment builds up against the use of the fossil fuel in India which is home to some of the world's most polluted cities. Maruti Suzuki, India's largest passenger vehicle maker, is in discussions with parent Suzuki Motor Corp. on the future of diesel cars in the country which include whether the company should completely cease producing diesel vehicles, said three people aware of the development. Instead, the company wants to expand its offerings of cars that run on compressed natural gas, the people said. Meanwhile, Mahindra, which is heavily dependent on diesel vehicles,...