Fuel consumption by powertrain, 2005-2019 United Kingdom
https://media.mas.to/masto-public/media_attachments/files/111/108/480/518/926/187/original/f4cc3da40828658f.png
Here's another interesting trend reversal: the lowest point for the average car fuel consumption in the UK was 2016. After that point Brits started buying bigger and heavier cars and the fuel consumption has been growing ever since.
The exact same thing can be seen in Germany.
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