Tata Motors is narrowing the gap with homegrown rival Mahindra & Mahindra (M&M) to challenge the position of third biggest pa++ssenger vehicle maker in India by sales. According to the latest SIAM data, Tata Motors is just 1,313 units shy of M&M during April-August this fiscal in the PV segment, which continued to be dominated by Maruti Suzuki India (MSI). In the reported period, M&M sold a total of…