Before the Frankfurt Motor Show, Peugeot was saying that its Peugeot 208 Hybrid FE Concept would emit just 49 grams of CO2 per kilometer. That's the equivalent of 111 miles per gallon (US) and it was an impressive enough number for the automaker to plaster it all over the side of the show car displayed on the stand. There's just one problem: the car is actually more efficient.
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