LONDON, July 14 (Reuters) - Northwest European gasoline refining margins rose by about $3 on Tuesday to $39.66 a barrel, buoyed by tight supplies and low inventories.

• A total of 10,000 metric tons of Eurobob E5 gasoline barges traded on Argus, with Trafigura, Aramco and ExxonMobil selling to MB Energy and Gunvor.

• A further 8,000 tons of Eurobob E10 barges traded, sold by TotalEnergies to MB Energy, ExxonMobil and Varo.

• Exxon sold an E5 barge to Sahara in the Platts window.

• U.S. President Donald Trump stepped back from a proposal to charge a 20% fee to guard the Strait of Hormuz as part of the conflict with Iran, saying on Tuesday he would instead seek investment deals with Gulf states.

• Nigeria's Dangote Petroleum Refinery has begun pricing fuel products for the local market in U.S. dollars, with a company spokesperson on Tuesday citing difficulties securing sufficient crude under the government's naira-for-crude programme and rising global oil prices.

• Gasoline and diesel refining margins have surged to levels last seen at the start of the war in Ukraine in 2022, consultancy Energy Aspects said. With refining capacity stretched, every outage risks outsized moves, and peak hurricane season is approaching, it said.