Fuel efficiency in the UK vehicle stock

Abstract Despite low real oil prices, interest in car fuel efficiency is undergoing a revival in recognition of its role in determining passenger transport CO 2 emissions. This paper analyses some recent UK trends and attempts to disaggregate the changes between technical improvements, and shifts in model availability and consumer purchase patterns. The importance of car engine size is identified, together with the role played by recent emission regulations. The slowdown in the rate of improvement in fuel efficiency over the past decade is highlighted.