Exhibit 99.1

WESTERN REFINING

NORTHERN TIER

Moderator:     Jeff Beyersdorfer

December 22, 2015

10:00 a.m. ET

END

Forward-Looking Statements

This communication includes “forward-looking statements” by Western Refining, Inc. (“Western” or “WNR”) (which are protected as forward-looking statements under the Private Securities Litigation Reform Act of 1995) and by Northern Tier Energy LP (“Northern Tier” or “NTI”). The forward-looking statements reflect Western’s and/or NTI’s current expectations regarding future events, results or outcomes. Words such as “anticipate,” “assume,” “believe,” “budget,” “continue,” “could,” “estimate,” “expect,” “forecast,” “intend,” “may,” “plan,” “position,” “potential,” “predict,” “project,” “strategy,” “will,” “future” and similar terms and phrases are used to identify forward-looking statements. The forward-looking statements contained herein include statements related to, among other things, Western’s and NTI’s plans and expectations with respect to the merger, including the anticipated closing date, financing of the merger, composition of management and the boards of directors, the likelihood of completion of the merger including the satisfaction of closing conditions, the expiration or termination of all waiting periods and approval of the merger at a special meeting of the NTI unitholders; the anticipated effect of the acquisition on Western’s financial and operational results including for it to be immediately accretive to Western’s earnings per share; the ability of the merger to result in or to create: enhanced scale, an expanded and diversified asset base with access to advantaged crude oil, flexibility to sell NTI traditional logistics assets to Western Refining Logistics, LP (“WNRL”), improved access to capital, a simplified organizational structure that is easier for investors to understand or that will improve equity valuation, and increased operational and financial flexibility; the impact the merger will have on how Western is viewed by the capital markets and rating agencies including the potential for improved credit rating or additional trade credit from counterparties; anticipated synergies including the amounts of such synergies; the benefits of combining WNR and NTI under a single c-corp organizational structure including that this structure is a proven vehicle for operating and growing a refining platform, provides a broader pool of investor capital, offers the potential to lower the cost of capital and create a more competitive acquisition currency, and enables the efficient management of working capital and growth capital projects; the development of pipeline and storage logistics assets in the Permian, Four Corners, Bakken and Canadian regions; the ability to implement the Western wholesale distribution model at NTI; expansion of the retail footprint; the El Paso refinery expansion and anticipated throughput; continuation of the strategy to sell traditional logistics assets to WNRL and redeploy capital to fund future projects and return cash to shareholders; elimination of single asset risk; and the future financial and operating performance of the merged company. These statements are subject to the risk that the merger is not consummated at all, including due to the inability of Western or NTI to obtain all approvals necessary or the failure of other closing conditions, as well as to the general risks inherent in Western’s and NTI’s businesses and the merged company’s ability to compete in a highly competitive industry. Such expectations may or may not be realized and some expectations may be based upon assumptions or judgments that prove to be incorrect. In addition, Western’s and Northern Tier’s business and operations involve numerous risks and uncertainties, many of which are beyond Western’s and NTI’s control, which could materially affect their respective financial condition, results of operations and cash flows and those of the merged company. Additional information relating to the uncertainties affecting Western’s and NTI’s respective businesses is contained in their respective filings with the Securities and Exchange Commission (the “SEC”). The forward-looking statements are only as of the date made, and neither Western nor NTI undertake any obligation to (and each expressly disclaims any obligation to) update any forward-looking statements to reflect events or circumstances after the date such statements were made, or to reflect the occurrence of unanticipated events.

Important Notice to Investors

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval in any jurisdiction where such an offer or solicitation is unlawful. Any such offer

will be made only by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, pursuant to a registration statement filed with the SEC. The proposed transaction will be submitted to NTI’s unitholders for their consideration. Western will file a registration statement on Form S-4 with the SEC that will include a prospectus of Western and a proxy statement of NTI. Western and NTI will also file other documents with the SEC regarding the proposed transaction. INVESTORS AND SECURITY HOLDERS OF NTI ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND ANY OTHER RELEVANT DOCUMENTS THAT WILL BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. Investors and security holders may obtain free copies of the proxy statement/prospectus and other documents containing important information about Western and NTI once such documents are filed with the SEC through the website maintained by the SEC at www.sec.gov. Copies of the documents filed with the SEC by Western will be available free of charge on Western’s website at www.wnr.com under the “Investor Relations” section or by contacting Western’s Investor Relations Department at (602) 286-1530. Copies of the documents filed with the SEC by NTI will be available free of charge on NTI’s website at www.northerntier.com under the “Investors” section or by contacting NTI’s Investor Relations Department at (651) 769-6700.

Participants in Solicitation Relating to the Merger

Western, NTI and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the unitholders of NTI in connection with the proposed transaction. Information about the directors and executive officers of Western is set forth in the Proxy Statement on Schedule 14A for Western’s 2015 annual meeting of shareholders, which was filed with the SEC on April 22, 2015. Information about the directors and executive officers of the general partner of NTI is set forth in the 2014 Annual Report on Form 10-K for NTI, which was filed with the SEC on February 27, 2015. These documents can be obtained free of charge from the sources indicated above. Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the proxy statement/prospectus and other relevant materials to be filed with the SEC when they become available.