In 2013, 1 million new vehicles were registered.
The department revealed that petrol consumption in the period rose from 20.8 million litres a day to 22.4 million.
Meanwhile, diesel consumption rose only 2 per cent on year from 55.9 million litres a day to 57.1 million.
Somnuk Bomrungsalee, the director-general, attributed the slight increase in diesel consumption to an adjustment in the transport sector. Some companies have shifted to the cheaper NGV and LPG, he said.
In the period, NGV consumption rose 11 per cent from 7.7 million kilogramme per day to 8.5 million, while LPG consumption rose by 67 per cent from 2.9 million kilogramme to 4.8 million.