U.S. gasoline prices fell ahead of the midterm elections, with Brent crude dropping over 6% due to diplomatic progress between the U.S. and Iran. On Monday, the average price for regular gasoline in the U.S. was $4.17 per gallon, down 12 cents from last week; diesel prices fell to $6.29 per gallon. As a result, shares of oil and gas giants such as ConocoPhillips, Chevron, and ExxonMobil declined, while major U.S. stock indices rose.