Diesel prices lower in West Coast and Rocky Mountain regions, up everywhere else by admin | Dec 28, 2017 The average price of a gallon of on-highway diesel went up two-tenths of a cent to $2.903 per gallon for the week ending Monday, Dec. 25. This marks the first increase after three weeks of increases. Powered by WPeMatico Share this:Tweet Related Submit a Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Notify me of follow-up comments by email. Notify me of new posts by email.