Question: The Pagani Huayra is also unofficially faster around the track than the  a limited production hybrid sports car of which one was auctioned off for how much money?

Context paragraphs:
Porsche 918 Spyder: The Porsche 918 Spyder is a mid-engined plug-in hybrid sports car by Porsche.  The Spyder is powered by a naturally aspirated 4.6-litre V8 engine, developing 616 PS , with two electric motors delivering an additional 283 PS for a combined output of 899 PS .  The 918 Spyder's 6.8 kWh lithium-ion battery pack delivers an all-electric range of 12 mi under EPA's five-cycle tests.  The car has a top speed of around 340 km/h .

Ferrari F12: The Ferrari F12berlinetta (also unofficially referred to as the F12 Berlinetta or the F12, and unofficially stylized as the F12B for short) is a front mid-engine, rear-wheel-drive grand tourer produced by Italian sports car manufacturer Ferrari.  The F12berlinetta, debuted at the 2012 Geneva Motor Show, replaces the 599 series grand tourers.  The naturally aspirated 6.3 litre Ferrari V12 engine in the F12berlinetta has won the International Engine of the Year Awards 2013 in the Best Performance category and Best Engine above 4.0 litres.  The F12berlinetta was named "The Supercar of the Year 2012" by car magazine "Top Gear".

Pagani Huayra: The Pagani Huayra (] ) is an Italian mid-engined sports car produced by Pagani.  Succeeding the company's previous offering, the Zonda, it had a base price of €850,000.  It is named after Huayra-tata, a Quechua wind god.  The Huayra was named "The Hypercar of the Year 2012" by "Top Gear" magazine and received a very positive review when tested by Richard Hammond on "Top Gear".  The Huayra was previously the fastest road car to go around the Top Gear Test Track, setting a time of 1:13.8, beating the previous record of 1:15.1 set by the Ariel Atom V8 in January 2011, and also placed above other hypercars such as the Aston Martin Vulcan, Bugatti Veyron 16.4, Bugatti Veyron 16.4 Super Sport, Ferrari Enzo Ferrari, Koenigsegg CCX, Lamborghini Sesto Elemento, and Pagani Zonda F.  It is also unofficially faster around the track than the Ferrari LaFerrari.  However, in June 2016, the Huayra was beaten by the McLaren 675LT that set a record of 1:13.7.

Group 5 (racing): Group 5 was an FIA motor racing classification which was applied to four distinct categories during the years 1966 to 1982.  Initially Group 5 regulations defined a Special Touring Car category and from 1970 to 1971 the classification was applied to limited production Sports Cars restricted to 5 litre engine capacity.  The Group 5 Sports Car category was redefined in 1972 to exclude the minimum production requirement and limit engine capacity to 3 litres.  From 1976 to 1982 Group 5 was for Special Production Cars, a liberal silhouette formula based on homologated production vehicles.

LaFerrari: LaFerrari (project name, F150) is a limited production hybrid sports car built by Ferrari.  LaFerrari literally means "TheFerrari" in Italian language and in some other Romance languages, in the sense that it is the "definitive" Ferrari.  On December 3, 2016, a LaFerrari auctioned off for $7 million (£5,743,500.00) making this car "the most valuable 21st century automobile ever sold at auction".

Koenigsegg Regera: The Koenigsegg Regera is a limited production, plug-in hybrid sports car manufactured by Swedish high-performance sports carmaker Koenigsegg.  It was unveiled at the 2015 Geneva Motor Show.  The name Regera is a Swedish verb, meaning "to reign" or "to rule."  Only 80 units will be built, of which 40 have already been sold as of March 2016, each costing approximately .  The Regera was created and designed to be a more practical, luxurious, hypercar alternative to the rest of Koenigsegg's lightweight hypercar lineup, including the Agera RS and the .  Koenigsegg states that the Regera will be the most powerful and fastest accelerating production car ever.  The production of the Regera will result in Koenigsegg, for the first time ever, simultaneously having two models in production.

McLaren P1: The McLaren P1 is a British limited-production plug-in hybrid sports car produced by McLaren.  The concept car was capable of reaching speeds of 350 km/h with the limiter on.  Debuted at the 2012 Paris Motor Show, retail began in the UK in October 2013 and all 375 units were sold out by November.  Production ended in December 2015.  The United States accounted for 34% of the units and Europe for 26%.

Toyota FT-HS: The Toyota FT-HS is a hybrid sports car concept introduced at the 2007 North American International Auto Show.  Calty Design Research designed the concept.  FT-HS stands for Future Toyota Hybrid Sport.

BMW i8: The BMW i8 is a plug-in hybrid sports car developed by BMW.  The i8 is part of BMW's electric fleet "Project i" being marketed as a new sub-brand, BMW i.  The 2015 model year BMW i8 has a 7.1 kWh lithium-ion battery pack that delivers an all-electric range of 37 km under the New European Driving Cycle.  Under the United States Environmental Protection Agency cycle, the range in EV mode is 15 mi with a small amount of gasoline consumption.  Its design is heavily influenced by the M1 Hommage Concept car, which in turn pays homage to BMW's last production sports car prior to the i8: the BMW M1.

Honda J-VX: The Honda J-VX was the first hybrid sports car concept to employ Honda's Integrated Motor Assist electric hybrid system and was initially unveiled at the Tokyo Motor Show in October, 1997.  It achieved 70mpg (30km/l) and featured a 1.0 liter, 3 cylinder VTEC engine, supercapacitor electrical storage, an all-glass roof, airbag-like "air belts", used lightweight materials, and aerodynamic design.  Eventually it would evolve into the Honda VV, a Pre-production prototype of the Honda Insight.

Supporting paragraphs: Pagani Huayra LaFerrari
Answer: $7 million