Forbes’ Top 10 Most Expensive Cars of 2012 Published on September 17, 2012 in Top 10 by Gilles Olivier Photo: Koenigsegg Automotive 4 - Koeniggseg Agera R ($1,711,000). This highly ambitious small Swedish automaker designs made-to-order supercars. The Agera R is equipped with a 5.0-litre twin-turbo V8 that generates 1,115 horsepower. It can go from 0 to 100 km/h in 2.9 seconds.