“As the Brent-WTI spread began widening to average $5/b in the first five months of 2018 and $9/b on June 1, East Coast refineries again increased their receipts of domestic crude oil, but in far lower quantities than in 2015. Domestic crude oil accounted for 18% of total East Coast crude inputs for the first five months of 2018, compared with 55% in the first five months of 2015, when the Brent-WTI spread also averaged $5/b (Figure 2).”