McLaren hopes to appeal to a broader market with its brand-new 540C coupe, calling it the company’s most attainable car yet. The second model in the McLaren Sport Series (following the McLaren 570S) has been engineered for both road and track driving. The lightweight carbon-fiber tub and chassis make the 540C almost 330 pounds lighter than its closest market competitor, and its additional aerodynamic styling helps it achieve a zero-to-60-mph time of 3.4 seconds. The 3.8-liter, twin-turbocharged V-8 engine gene…