I also think (THINK, not totally sure) that these "measurements" are less than the actual measurements. The reason being that the shot is taken at an angle, not straight on the car. The line drawn from wheel to wheel is actually SHORTER than the distance between the two wheels. Notice how this line is NOT parallel with the yellow lines of the pavement markings. Car and pavement markings are parallel with each other, therefore the line drawn between the two wheels would have to match that angle. Also, the shot is taken not only at a x-axis angle, it also slightly off the z-axis as well (or pitch/yaw, not super familiar with these terms), I believe you can't even translate any of these distances into real world. Not trying to be too critical (I appreciate the effort), I realize these are very rough estimates, just thought I'd throw in my two cents.
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