Classic car values are soaring, hot on the heels of gold as the best-performing investment that money can buyThe passion of collecting knows no bounds in the classic car sector, according to a new index compiled by international real estate specialists, Knight Frank.The Knight Frank Luxury Investment Index - part of The Wealth Report, launched at Claridges yesterday - highlights an astonishing 395% value growth* in classic cars over the last decade amongst high net worth individuals (HNWI). This supercharged boost in classic car values outstrips all but gold as an investment.  It also marks an interesting change in the collector psyche, according to classic car auction specialist, Historics at Brooklands, whose major sales of fine classic and collector motorcars is attracting increasing international interest.I believe we are seeing a marked shift in attitudes to investment, says Historics Auction Director, Edward Bridger-Stille. But for its rising value as a precious commodity, its perhaps difficult to get passionate about the possession of gold, whereas ownership of a classic motor car is a truly engaging, head and heart experience, aside from being a fast-appreciating asset.We are conscious of increased international interest in collector car acquisition amongst those who previously may have prioritised an alternative, more rational  investment portfolio, he continued. And reports such as that of Knight Frank will continue to drive confidence in ownership in the collector car category.Andrew Shirley, editor of The Wealth Report, added: Our research shows that HNWIs, particularly those from the burgeoning economies of Asia, Latin America and Africa, are becomingly increasingly interested in investments of passion such as classic cars. This is helping to drive values ever higher.The Report is published days before Historics at Brooklands next auction of 120 fine classic and collector cars on March 9 at Brooklands Museum, Surrey.  For more information call 01753 639170, e-mail: auctions@historics.co.uk, or see the website, historics.co.uk.For full details of the Knight Frank Luxury Investment Index or to download a copy of The Wealth Report, please go to knightfrank.com/wealthreport* Ref: The HAGI Classic Car Index