An owner-contributed database will, I feel, be even more confusing. Unless everyone lists exactly what options and accessories they have fitted, there will be no end of discussion why their particular car is 50kg heavier or lighter than somebody else's of a similar type. As likely as not, they will forget to mention whether they have a relatively heavy demountable forged swan-neck towbar or a lighter fixed one or they haven't checked that the fuel tank was 90% full (per legal definition of kerbweight). Furthermore, probably no 2 cars will have the same specification. Also, the larger the car, the bigger the weight range. For the Galaxy, for example, Ford quote a kerbweight range of over 300kg between the lightest and the heaviest version (even when comparing vehicles with the same engine specification). To add to the complication, production build tolerances alone can account for up to 15kg difference between 2 vehicles of identical specification. If anyone is really that particular, there is no way round a trip to a public weighbridge. For most purposes though, 100kg either way is not going make or break towing characteristics or performance, especially as towing with the car at kerbweight is, in most cases, not a very representative condition. Because of their legal significance, the only figures that are really important are GVW, max. permissible front and rear axle loads, gross train weight and noseweight.