This April 25, 2017, photo, shows an Exxon service station sign in Nashville, Tenn. Exxon Mobil Corp. reports earnings Friday, Feb. 2, 2018. (AP Photo/Mark Humphrey)
In this Tuesday, April 25, 2017, photo, gas prices are displayed at a Mobil station in Alameda, Calif. Exxon Mobil Corp. reports earnings Friday, Feb. 2, 2018. (AP Photo/Ben Margot)
In this Monday, April 24, 2017, photo, a car drives away from a Mobil gasoline station in Londonderry, N.H. Exxon Mobil Corp. reports earnings Friday, Feb. 2, 2018. (AP Photo/Charles Krupa)
In this Tuesday, May 2, 2017, photo, Alex Uriarte pumps gas at a Chevron station in Miami. Chevron Corp. reports earnings, Friday, Feb. 2, 2018. (AP Photo/Alan Diaz)
This Tuesday, May 2, 2017, photo shows a Chevron sign at a gas station in Miami. Chevron Corp. reports earnings, Friday, Feb. 2, 2018. (AP Photo/Alan Diaz)
