Sure. The Lamborghini SVJ, for example, is listed at 1715kg (for Mass in Running Order). The SVJ weighs around 1750kg in magazine tests. So the SVJ is listed as being much lighter. The WLTP weight is listed at 1912kg.
Looking at the Mclaren 720S (coupe only), though, the Mass in Running Order is listed mostly as 1494kg. Which would be more than magazine weight (around 1430kg). The WLTP is listed at 1585kg.
So one is lighter, one is heavier, but also the differences between the Mass in Running Order and WLTP are not consistent at all. One has a difference of 200kg and one of 90kg.
The Huracan Performante is listed at 1567kg - which is about the same as magazine tests and the WLTP is 1708kg - 150kg difference. The Mass in Running Order for the car is also all over the place, even trying to select "coupe" only, ranging from 1567kg, to 1607kg, to 1692kg. And that's all cars registered in the GB!
Do you have a maximum laden mass for any of those cars?
What follows is just my understanding, and again, not gospel... sorry for the long post...
There's 4 weights that come into play.
Mass in running order (a car with standard equipment)
Vehicle L Mass (Vehicle L is a vehicle that is configured in the most efficient way)
Vehicle H Mass (Vehicle H is a vehicle that is configured in the least efficient way)
Maximum technical laden mass
You can, on paper, change the WLTP tested mass simply by altering the stated Maximum laden weight, without changing a single thing on the car. If you have a Max laden mass of 2000kg, and you reduce that to 1750kg without the car being any different, you could claim a lower WLTP by something like ~20kg nominally.
The existence of an option (not standard equipment) that reduces the overall efficiency of the car, but increases weight (perhaps a high downforce, draggy, aero pack that weighs 50kg for example?) may well also allow for a lower WLTP weight to be claimed, even in the absence of that option on the car.
Now, the important thing to remember is that the L and H masses don't represent the lowest and highest weights, but the weight in the vehicles most and least efficient configuration. You have to judge not only the mass of the options (or reduction on
optional delete items), but which of the Vehicle H and L masses they'll actually affect. Get the
full options list for the cars you mention, make two columns next to it, and for each option, write the weight in the left column if it will make the vehicle more efficient, and in the right column if it makes it less efficient. My guess is that the difference in the totals of those two columns goes a long way to explaining the descrepencies... (along with quoted max laden mass).
There's also an element to the WLTP weight which is a 25kg arbitrary added mass, and a % of the vehicle weight in it's H spec. As such, there's almost both a fixed offset from claimed weight, and on top of that, a proportional one.
The thing is with the WLTP weight, is that whatever they claim for running order and max laden mass, the test car has to be between the Vehicle L and H masses derived from them - so to a degree it has to be real world representative.
Because this is all based on what is probably a (relatively) simple formula, you
know the manufacturers are gaming the numbers to give whatever the most favourable outcome is. It certainly seems possible that you could have two different models perfectly balanced on some scales, and they'd have different quoted weights based purely on the fact one is using a +400kg max laden mass, and one is using +200kg.
I recently posted about why it has been in the interests of some manufacturers to go with inflated weights because it gives them more lenient emissions targets... I don't think it's safe to ever assume anything that comes out of legislation is intuitive, and similarly it's never safe to assume anything that comes out of marketing materials is honest.
I tried to build a bit of a model for this using the Valkyrie. I can get to the WLTP test mass of 1477kg using the Revenue weight and mass in running order, if there's (IIRC) a 60kg weight difference in options between the most test friendly Valkyrie, and the least - I've
no idea how that translate to reality or not.
