CUED Publications database

Do technical improvements lead to real efficiency gains? Disaggregating changes in transport energy intensity

Craglia, M and Cullen, J (2019) Do technical improvements lead to real efficiency gains? Disaggregating changes in transport energy intensity. Energy Policy, 134. ISSN 0301-4215

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Abstract

Fuel economy standards are a key measure to increase the rate of efficiency improvements in passenger cars. The fuel consumption of vehicles can be improved in three ways: incremental technical efficiency improvements within powertrain technologies, market shifts to more efficient types of powertrains and by limiting increases in the size and performance of vehicles. This study quantifies the effect of each of these three drivers on the fuel consumption of British vehicles between 2001 and 2018 using driver-reported data on real-world fuel consumption. Analysis shows the introduction of EU fuel economy standards in 2008/09 had little effect on the rate of real technical efficiency improvements in British vehicles. Instead of adopting technical improvements at a higher rate or limiting the size and power of vehicles, these results suggest vehicle manufacturers met emissions standards by increasing the divergence between laboratory tests and real-world fuel consumption. This study adds to the growing literature calling for official test procedures to be representative of real-world driving.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Div E > Sustainable Manufacturing
Depositing User: Cron Job
Date Deposited: 13 Sep 2019 20:41
Last Modified: 10 Apr 2021 22:16
DOI: 10.1016/j.enpol.2019.110991