Xoi is weak,and all the refiners follow it,blow-by-blow. Also all the MMs keep the refiners prices very volatile.
The trick is to have some of all of them and sell the hot ones every day.They just rotate around every day.Play the 5 day SMA...good signals,be nimble.
I was nimble yesterday and lucked out when I got out at 83. I was not so nimble when I bought it at 89 and it dropped to around 76. But I got back in at 80 and sold at 83. I'm learning. Overall I have made $12,000 on MPC since January this year. So I guess I better stay nimble and not get too greedy like when I bought it back at 89.