* Uber aiming for valuation of $80.5 billion to $91.5 billion. : LONDON (Reuters) - Uber Technologies Inc Chief Executive Dara Khosrowshahi sought to persuade money managers in London that the loss-making ride hailing firm’s growth plans justified a valuation of up to $91.5 billion in an initial public offering (IPO). In the ballroom at Claridge’s, the five-star hotel in London’s wealthy Mayfair district, over 100 investors listened on Monday to Khosrowshahi and CFO Nelson Chai talk about the company’s plans to expand their food delivery business and venture into other new business areas like shopping.