The Koenigsegg One:1 is a Swedish sports car produced by Koenigsegg Automotive AB. It was first unveiled at the 2014 Geneva Motor Show. The One:1 has a top speed of 273 mph and can accelerate from 0 to 60 mph in just 2.8 seconds. It is powered by a 5.0-liter V8 engine that produces 1,341 horsepower. The One:1 is a limited edition car, with only six units being produced.