The U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energyâ€™s (EERE) Bioenergy Technologies Office (BETO) and Vehicle Technologies Office (VTO) are seeking stakeholder input on its Optima initiative, a DOE sponsored program focused on the development of new fuels and engine architectures that are co-optimizedâ€”designed in tandem to maximize performance and carbon efficiency. DOE is specifically interested in stakeholder input on 1) perspectives and interest in co-optimization of fuels and engines, 2) technical aspects of fuel and advanced compression ignition (ACI) engine interactions and 3) barriers to market acceptance and deployment of co-optimized fuels and engines. The purpose of this RFI is to solicit feedback from industry, academia, research laboratories, government agencies, and other stakeholders on issues related to the Optima initiative. EERE is specifically interested in information regarding additional areas of research that universities and others are interested in contributing to and collaborating on. This RFI will help BETO and VTO understand the additional areas of research, capabilities, and yet to be addressed barriers and opportunities for stakeholder engagement relative to the co-optimization of engines and fuels. This is solely a request for information and not a Funding Opportunity Announcement (FOA). EERE is not accepting applications. This RFI is not a Funding Opportunity Announcement (FOA); therefore, EERE is not accepting applications at this time. EERE may issue a FOA in the future based on or related to the content and responses to this RFI; however, EERE may also elect not to issue a FOA. There is no guarantee that a FOA will be issued as a result of this RFI. Responding to this RFI does not provide any advantage or disadvantage to potential applicants if EERE chooses to issue a FOA regarding the subject matter. Final details, including the anticipated award size, quantity, and timing of EERE funded awards, will be subject to Congressional appropriations and direction. Any information obtained as a result of this RFI is intended to be used by the Government on a non-attribution basis for planning and strategy development; this RFI does not constitute a formal solicitation for proposals or abstracts. Your response to this notice will be treated as information only. EERE will review and consider all responses in its formulation of program strategies for the identified materials of interest that are the subject of this request. EERE will not provide reimbursement for costs incurred in responding to this RFI. Respondents are advised that EERE is under no obligation to acknowledge receipt of the information received or provide feedback to respondents with respect to any information submitted under this RFI. Responses to this RFI do not bind EERE to any further actions related to this topic. The full RFI is posted on the EERE eXCHANGE website at https://eere-exchange.energy.gov. Responses to this RFI must be submitted electronically to OptimaRFI@ee.doe.gov no later than 5:00pm (ET) on January 8, 2016. Responses must be provided as attachments to an email. It is recommended that attachments with file sizes exceeding 25MB be compressed (i.e., zipped) to ensure message delivery. Responses must be provided as a Microsoft Word (.docx) attachment to the email, and no more than 5 pages in length, 12 point font, 1 inch margins. Only electronic responses will be accepted. This is a Request for Information (RFI) only. EERE will not pay for information provided under this RFI and no project will be supported as a result of this RFI. This RFI is not accepting applications for financial assistance or financial incentives. EERE may or may not issue a Funding Opportunity Announcement (FOA) based on consideration of the input received from this RFI.