Mahindra & Mahindra on Friday reported its best- ever monthly sales in October with 96,648 units, marking a 20 per cent year-on- year increase. The Mumbai-based auto major had dispatched 80,679 units to dealers in October last year. In the utility vehicles segment, it sold 54,504 units in the domestic market, a growth of 25 per cent over 43,708 units in the year-ago period.