Greenpeace's SmiLE Project proved 70mpg was possible in 1995
The vehicle itself is labeled with the words "First Aid for the environment - same performance, half the fuel usage." That's not an exaggeration. Before the work, the Twingo used 6.7 liters per 100 km (35mpg U.S.) and afterwards just 3.3 (71mpg U.S.). Thanks to Slim for the tip!
[Source: Greenpeace (link is in German)]
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