The barge crack swap has been heading down since the second half of May but rose slightly to $11.15 a barrel for the US holiday. It has since declined to around $10.70 a barrel.
US gasoline demand over the past four weeks is down 1.8 percent from the same period a year ago, the US Energy Information Administration said last week.
ExxonMobil Corp's 362,300-barrel-per-day (bpd) Beaumont, Texas, refinery shut the hydrocracker on Sunday due to a leak found after the unit restarted on Saturday, sources familiar with plant operations said on Monday.
South Korean and Japanese refiners are running their plants at near-maximum capacity to cash in on profit margins that are at five-month highs, industry sources told Reuters on Friday. GASOLINE
No barges of benchmark Eurobob traded. Only two bids surfaced at $493 and $495 a tonne fob Amsterdam-Rotterdam-Antwerp, up from a Friday deal at $485 a tonne fob ARA.
Outside the window, some 6,000 tonnes of eurobob barges traded at $489-$490 a tonne fob Amsterdam-Rotterdam, compared with $485.50-$495 a tonne on Friday.
No barges of premium unleaded gasoline traded. An offer surfaced at $503 a tonne fob ARA. On Friday, a barge traded at $499 a tonne fob ARA.
The August swap stood at $495 a tonne at the close, up from $490 a tonne.
Brent crude futures were up 47 cents a barrel at $47.18 a barrel at 1534 GMT.
The benchmark ebob gasoline refining margin edged higher to $12.30 a barrel from $12.16 a barrel.
US front-month RBOB gasoline futures were up 0.65 percent at $1.5080 a gallon.
The RBOB crack versus US crude stood at $18.66 a barrel, down from $18.70 a barrel at the previous close. NAPHTHA
No naphtha cargoes traded.