BMW i8 (2016) is 80 mm (3.15 inch) wider and 122 kg (269 lbs) lighter than Buick Regal TourX (2020).
Buick Regal TourX (2020) is 297 mm (11.69 inch) longer, 190 mm (7.48 inch) higher and has 446 liters (15.75 ft3) bigger cargo space than BMW i8 (2016).