Spot demand from Vietnam and term demand for reformate from Taiwan supported gasoline margins, traders said.

Potential demand increase from Indonesia ahead of a refinery maintenance in March could also support fundamentals, they added.

Indonesia's Pertamina will shut its Balikpapan refinery for maintenance and carry out maintenance on the single point mooring (SPM) system for its Cilacap refinery in March, according to three sources close to the matter.  

The 260,000 barrel per day (bpd) Balikpapan refinery in East Kalimantan province will shut for 30 days, said an integrated supply chain official from Pertamina, declining to say which specific units at the plant would be affected.

Pertamina's 348,000 bpd Cilacap refinery in southwestern central Java will operate normally during the maintenance work, two other sources with knowledge of the matter said.

A string of refinery issues in the United States also supported gasoline margins in Asia, traders said.