Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/55067
Title: The drivers behind differences between official and actual vehicle efficiency and CO2 emissions
Authors: Jiménez, Juan Luis 
Valido, Jorge 
Molden, Nick
UNESCO Clasification: Investigación
Keywords: Fuel Consumption
Passenger Cars
Emissions
Air pollution
Vehicles’ efficiency, et al
Issue Date: 2019
Journal: Transportation Research Part D: Transport and Environment 
Abstract: 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
Source: Transportation Research Part D: Transport and Environment [ISSN 1361-9209], v. 67, p. 628-641
Appears in Collections:Artículos
Show full item record

SCOPUSTM   
Citations

12
checked on Aug 1, 2021

WEB OF SCIENCETM
Citations

12
checked on Aug 1, 2021

Page view(s)

39
checked on Jul 31, 2021

Google ScholarTM

Check

Altmetric


Share



Export metadata



Items in accedaCRIS are protected by copyright, with all rights reserved, unless otherwise indicated.