The body was also more aerodynamic than previous LS sedans (Cd 0.26; 0.25 with air suspension),[89] and was the product of wind tunnel testing at facilities used for Shinkansen bullet train development.[92] A 76-millimetre (3.0 in) wheelbase stretch resulted in more interior volume and allowed the engine to be positioned further aft for better balance.[93] Trunk space was increased by one-third due to repositioning of the fuel tank.[8]