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Consider the recent models of the Mini Cooper, which is a scale model (not minifig-scale) of a real car. It measures nearly as long as the Ghostbusters Ecto 1 car, which is meant to be minifig-scale. The Ecto 1 is as long as it is because it has to be wide enough to accomodate the windsheild parts used and all the detailing. But making the car look good, and fit a minifig inside, results in something that is comically over-sized for minifigs.
My advice is to pick some limiting factor and set your scale based on that. Want a car that seats 4 figures? it has to be a certain width: at least 7 studs wide, probably. If it's 7 studs wide, then how long would it be? Depends on the car, I guess.
Again it will not be exact, if that is what folks are looking for they will not find it as I believe that LEGO minifig scale is 'L' scale, (meaning LEGO scale to me). it is the same reason why trains are only 6 studs wide, when those who try to build near replicas go 8 studs wide.
so my helm's deep has a 25cm high tower, which means 10m at 1:40. I think it would be about 3m large as well.
The jeep from the JW set is a 'larger' scale, which I thought would look better in my modular city. It is more realistic in terms of real proportions. Alas, it does not fit on the roadway baseplates.
And when put next to the Ecto-1, it's completely oversized. Or the service truck, prisoner transport one has similar issues.
The 1:87 Town Plan Scale of 1955-73.
I'm fairly confident the licensed racing sets are 'more' to scale than the jeep.
Although, based on their scale in the film, the JW dinosaurs should probably be substantially larger.