{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T00:24:34Z","timestamp":1773102274028,"version":"3.50.1"},"reference-count":97,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T00:00:00Z","timestamp":1773014400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia, I.P.","award":["UID\/50022\/2025"],"award-info":[{"award-number":["UID\/50022\/2025"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Energies"],"abstract":"<jats:p>Road transport decarbonization remains a strategic priority in the context of the global climate emergency. Between 2013 and 2024, most economic sectors in the European Union reduced emissions, whereas the transport and storage sector increased them by 14%, largely driven by road freight demand. This review provides an updated overview of the decarbonization status of the road transport fleet across all segments, with particular focus on heavy-duty freight, which remains 97.9% fossil-fuel dependent. It examines short- and medium-term decarbonization pathways for the existing fleet, highlighting liquid biofuels as an immediately deployable option where full electrification is constrained by technological and economic barriers. Among these options, fatty acid methyl ester (FAME) and hydrotreated vegetable oil (HVO) stand out due to their compatibility with current engines and fuel distribution infrastructure, but each presents specific limitations. Biodiesel raises concerns over long-term engine durability, while HVO requires further evidence on its impact on NOx emissions and fuel lubricity. When these sustainable fuels are used with or without fossil diesel, there are still several unanswered questions. The emerging use of HVO\/FAME blends is therefore discussed as a promising route to mitigate the drawbacks of each fuel, and a research agenda is proposed to support accelerated decarbonization of heavy-duty road freight in the EU.<\/jats:p>","DOI":"10.3390\/en19051382","type":"journal-article","created":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T13:27:18Z","timestamp":1773062838000},"page":"1382","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Decarbonization of EU Road Freight Transport in the Short and Medium Term Through Renewable Liquid Fuels\u2014A Review"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2053-5742","authenticated-orcid":false,"given":"Ricardo","family":"Almeida","sequence":"first","affiliation":[{"name":"School of Technology and Management, ADAI, Polytechnic of Leiria, 2411-901 Leiria, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2864-7597","authenticated-orcid":false,"given":"Luis","family":"Serrano","sequence":"additional","affiliation":[{"name":"School of Technology and Management, ADAI, Polytechnic of Leiria, 2411-901 Leiria, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-4463-9266","authenticated-orcid":false,"given":"Diogo","family":"Silva","sequence":"additional","affiliation":[{"name":"School of Technology and Management, ADAI, Polytechnic of Leiria, 2411-901 Leiria, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6686-7991","authenticated-orcid":false,"given":"Helder","family":"Santos","sequence":"additional","affiliation":[{"name":"School of Technology and Management, ADAI, Polytechnic of Leiria, 2411-901 Leiria, Portugal"}]},{"given":"Jo\u00e3o","family":"Pereira","sequence":"additional","affiliation":[{"name":"School of Technology and Management, ADAI, Polytechnic of Leiria, 2411-901 Leiria, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0739-9811","authenticated-orcid":false,"given":"Manuel Gameiro da","family":"Silva","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, ADAI, University Coimbra, 3004-531 Coimbra, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,9]]},"reference":[{"key":"ref_1","unstructured":"(2025, April 22). 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