Diesel average heads up for the eighth straight week, EIA reports by admin | May 16, 2018 With a 6.8-cent increase, the average price per gallon now stands at $3.239 per gallon. This is the highest weekly average since the week of December 29, 2014, when the average stood at $3.213. Powered by WPeMatico Share this:Tweet Related Submit a Comment Cancel reply Your email address will not be published.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.