The 2013 Agera R from Swedish automaker Koenigsegg is a marvel of engineering achievement: a supercar boasting as much as 1,140 horsepower, depending on your fuel of choice. The Agera R has an upgraded fuel and engine management system with enough flow capacity to generate 1,140 horsepower and 1,200 Nm of torque on E85 and E100 biofuel. Switching to 98 octane unleaded will drop the Agera R's output to "just" 940 horsepower.

Its aluminum 5.0-liter V8 features four valves per cylinder, twin turbochargers and a seven-speed dual clutch gearbox. The Agera R can accelerate from 0 to 60 mph in just 2.9 seconds, hit 124 mph in 7.5 seconds, and achieve a top speed of 245 mph.

The Agera R is the only roadster hypercar with a detachable and stowable hardtop. The top has a glass roof. Available in left or right-hand drive, the car also features: power windows, adaptive rear wing, adjustable pedals and steering column, carbon ceramic brakes with Sport ABS, hydraulic lifting system, power steering, power brakes, adjustable seats, extra four-point seatbelts for track use, satellite navigation, Intelligent LifePo4 battery, MP3 player, USB connection, climate control, digital warning and info system, G sensor, alarm, tire monitoring system, silver key, leather carpets, roof storage bag, and a car cover. Options include fitted luggage, special leather and colors, fully visible carbon fiber body panels, Inconel exhaust, front winglets, rear-view camera, heated seats, a ski box for the roof, and a winter wheel package.

Its base price is approximately $2,500,000.

• Wheelbase, inches: 104.8
• Weight, lbs: 3,163
• Length, inches: 169
• Width, inches: 78.6
• Height, inches: 44.1
• Base price: $1,611,000

• Type: V-12
• Displacement: 307 cu in (5035 cc)
• Engine: Koenigsegg aluminum 5.0L V8
• Compression ratio: 9.0:1
• Horsepower @ rpm: 1140 hp @ 7100 rpm
• Suspension: Double Wishbone
• Torque @ rpm: 1000 lb-ft @ 2700-6170 rpm
• Transmission: 7-Speed Dual Clutch

• Top Speed, mph: 273 mph
• 0-60 mph, sec: 2.8 seconds