There are many norms to scale car weight
EU-Norm EG92/21
EU directive 94/48/EC
car weight is scaled with 90% filled up tank + 75kg for driver and baggage (68kg driver +7kg baggage =75kg)
DIN 70020
car weight is scaled with 90% filled up tank
curb weight US
standart equipment car in running conditions (oil/water) with full tank of fuel
dry weight
without, fuel, oil, coolant, brake fluid, power steering fluid, transmission fluid, washer fluid
shipping weight
basic vehicle with no options, working conditions only a small amount of fuel
so you have exactly the same car and 5 different weights and all are right...