Originally Posted by davesaddiction
How is their weight measured so much lighter than BMW's official curb weight? They measure with a full tank, don't they?
Well, there's weight, then their's weight. Some facts from forum member T Bone back in 2007, with a few of my edits:
•US Curb Weight = Weight of Car with standard accessories, full fluids, no driver
•EU Weight = Weight of Car with 90% fuel, 68 kg driver, 7 kg cargo
•Unladen Weight = Appears to be Curb Weight less 8 kg (can't find definition)
•1 US Gallon = 3.8 liters
•Weight of 1 US Gallon of Gasoline = 6.35 pounds (2.87 kg)
•Weight of 1 liter of Gasoline = 1.67 pounds (0.76 kg)
Equations for Weight Conversion:
•Curb Weight (metric) = EU1 Weight - 68kg for driver - 7 kg for cargo + (0.1 X Fuel Capacity X 0.76)
•EU Weight (metric) = Curb Weight + 68 kg for driver + 7 kg for cargo - (0.1 X Fuel Capacity X 0.76)
•1 KG = 2.2 pounds
•EU Weight = 1655 kg
•Curb Weight (manual) = 1655 kg - 68 kg - 7 kg + (0.1 X 63 liters X 0.76) = 1585 kg = 3,487 lb.
•US Unladen weight per MBUSA (manual) = 3,707 lb.
Certainly options standard or required here lead to some difference; the rest is up to your conjecture, unless someone has definitive information.