[Avocet]

"Mass in Running Order", in type apporval terms, means the mass of the empty vehicle, with all tools, (jack, spare etc) normally carried, all fluids (oil, coolant, brakes, screenwash etc), a 90% full tank of fuel, and a 75kg driver.

You "kerb weight" (not quite sure how that's defined) ought to be mass in running order, LESS the 75kg for the driver (and maybe the fuel if kerb weight doesn't include fuel). If you can get hold of a copy of an EC Certificate of Conformity for your car, it should relate to your particular vehicle - they're unique to each vehicle. Ask your dealer. they may charge though. The CoC states Mass in running order. "kerb weight" is a vague and ancient UK concept that isn't really used in the rest of Europe. I've never weighed out T30, but intuitively, 1700kg seems a bit heavy (and a suspiciously round number)!

Any scrapyard will have a weighbridge and they ought to be calibrated regularly by (I think!) Trading Standards. When I built myself a trailer recently, I went round to my local scrapper and they charged me a couple of quid for a "ticket".

 

[Avocet]

The DVLA's "Mass in Service" is the same as the EC definition of "Mass in Running Order" - so it's supposed to be an empty car, plus 75kg driver and 90% full tank of fuel. You could call Nissan and ask for an EC Certificate of Conformity for your car. It will be a dump of a load of the type approval data and will include not ony the Mass in Running Order (Field 12.1), but all the towing weights. A Certificate of Conformity is unique to each particular car (it will have your car's VIN on it). The weight ought to be right to within 5% (that's the tolerance they're allowed) of what it weighed when it left the factory.

BEWARE, some manufacturers make a charge for a CoC - could be up to £100!

If it were me, I'd spend a tenner (probably less) and just park it on the weighbridge at my local scrap merchants. They're usually only too happy to oblige.

 

[Avocet]

"Mass in Service" on a Certificate of Conformity, already includes a 75kg driver and 90% full tank of fuel.