LONDON, Dec 20 (Reuters) - Benchmark northwest European gasoline barge refining margins fell $1 to around $9 per barrel on Monday amid concerns over surging Omicron coronavirus cases in Europe and the United States, and new mobility restrictions. Oil prices slumped by about $3 as the Omicron threat loomed over winter holidays in Europe and the United States. read more U.S. gasoline prices have dropped in time for the major holiday driving season, but not everyone around the country is feeling the same relief at the pump. read more U.S. motorists drove 7.1% more miles in October over 2020 levels as people return to offices and leisure trips, but the distance is off slightly from pre-pandemic levels. read more OPEC+ compliance with oil production cuts stood at 117% in November, up from 116% the previous month, two sources from the group told Reuters, indicating the group"s production levels continue to be below agreed targets. read more U.S. oil refiners are expected to have 45,000 barrels per day (bpd) of capacity offline for the week ending Dec. 24, increasing available refining capacity by 180,000 bpd, research company IIR Energy said on Monday. Gasoline (in tonnes) Trades (vol.) Bids Offers Prev. Trades Sellers Buyers Ebob Barges MOC Platts E5 Ebob Barges E10 Platts(fob ARA) Ebob Barges Argus E5(fob AR) $655.50 - $658.75 (10KT) $693.50 (10 barges) Litasco Varo, BP, Exxon Ebob Barges E10 Argus (fob AR) Jan swap fob ARA $656 $688.75 Premium Unleaded (fob ARA) $672 $705 (12 barges) Shell Litasco Cargoes Cargoes (cif NWE) Naphtha Ebob crack (per barrel) $8.937 prev. $10.071 Brent futures Rbob Rbob crack