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It's around the original Car Wars scale so being a devotee of 6mm, Mad Max and Car Wars I'm sorely tempted to flog off my 20mm MM project.
Let's not be too hasty here! That said if you can find the right rule set 6mm does seem a better scale for full on carnage.
I'd use a early version of Car Wars.
There are many CW substitutes that can be used.