The company said its domestic sales increased 13.5% during the month to 1,11,333 units as against 98,109 units in December 2014.
Sales of passenger cars went up 11.6% to 91,043 units as compared to 81,564 units in the year-ago month, MSI said in a BSE filing.
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The company said sales of utility vehicles, including Gypsy, Grand Vitara and Ertiga, jumped 58.8% to 9,168 units in December 2015 from 5,774 units in the corresponding month in 2014.
Sales of vans - Omni and Eeco - rose 3.3% to 11,122 units in December 2015 as compared to 10,771 units in the same period of last year.
Exports during the month declined 33.1% to 7,816 units as compared to 11,682 units in December 2014, MSI said.