BMW i8 (2016) is 1134 kg (2,500 lbs) lighter than Rolls-Royce Phantom (2014).
Rolls-Royce Phantom (2014) is 1402 mm (55.20 inch) longer, 47 mm (1.85 inch) wider, 348 mm (13.70 inch) higher and has 305 liters (10.77 ft3) bigger cargo space than BMW i8 (2016).