Or backspace if you prefer.

My Van Diemen has OZ wheels which IIRC have an offset of +4.3mm (i.e. wheel centreline 4.3mm closer to the car centreline than the wheel mounting face). With the flanges on them that's an 81.15mm backspace (just over 3 3/16").

So what's the range?

Which cars require the largest positive offset (most backspace) and which the smallest? Do any cars run negative offset?