Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/55067
Título: The drivers behind differences between official and actual vehicle efficiency and CO2 emissions
Autores/as: Jiménez, Juan Luis
Valido, Jorge
Molden, Nick
Clasificación UNESCO: Investigación
Palabras clave: Fuel Consumption
Passenger Cars
Emissions
Air pollution
Vehicles’ efficiency, et al.
Fecha de publicación: 2019
Publicación seriada: Transportation Research Part D: Transport and Environment 
Resumen: Literature explaining the gap between official and actual vehicle efficiency and CO2 emissions focuses on descriptive analysis to calculate this gap without examining causality. In this paper, we explore this discrepancy in detail by drawing on a database from Emissions Analytics Ltd. that provides on-road emissions measurement on more than 650 vehicles in the period 2010-2017. The data reveal concerning results: firstly, the gap in data relates both to hybrid vehicles (that are supposedly 'more fuel-efficient') and to the biggest selling vehicles (medium-sized cars). Secondly, the average deviation rate increased prior to 2015, but decreased following 'Dieselgate'. The Volkswagen scandal threw light on the discretionary behaviour of manufacturers on this question and highlighted how weak the official tests are: and this in turn points to a regulatory and compliance problem. In other words, the interpretation of the results suggests that after several years of adaptation to the protocol and the corresponding test (but no translated in real consumption), manufacturers have taken measures to reduce the divergence in real terms after the scandal.
URI: http://hdl.handle.net/10553/55067
ISSN: 1361-9209
DOI: 10.1016/j.trd.2019.01.016
Fuente: Transportation Research Part D: Transport and Environment [ISSN 1361-9209], v. 67, p. 628-641
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