I dont know were you guys get that weight numbers from but even Lotus claim on their homepage that the Elise S weights without fuel 924kg...
|Engine type||Supercharged I4|
|Displacement||1.8 l (110 ci)|
|Power||217 ps (214 bhp / 160 kw) @ 6800 rpm|
|Torque||249 Nm (184 lb-ft) @ 4600 rpm|
|Power / liter||121 ps (119 hp)|
|Layout||middle engine, rear wheel drive|