Curb weight (US English) or kerb weight (UK English) or unladen mass is the total weight of a vehicle with standard equipment, all necessary operating consumables such as motor oil, transmission oil, coolant, air conditioning refrigerant, and 1/2-tank of fuel, while not loaded with either passengers or cargo.
The 1/2-tank of fuel is used to represent the average weight of fuel-load on any given day. If a full-tank lasts 10-days, then we'd have 5-days above curb-weight and 5-days below curb-weight for a more accurate representation of performance where weight is a consideration.
This definition may differ from definitions used by governmental regulatory agencies or other organizations. For example, many European Union manufacturers include the weight of a 75 kilogram driver to follow European Directive 95/48/EC. Additionally, organizations may define curb weight with fixed levels of fuel and other variables to equalize the value for the comparison of different vehicles.
- "EU Commission Directive 95/48/EC". European Commission. Retrieved 2009-01-04.
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