Do not allow the Avgas to be run in a non aviation engine. Good chance that vehicle's systems would be damaged
It's quite commonly used in off-road engines in UK; my own car has been run on it quite successfully a number of times, albeit diluted as above. There is no need to run it "neat" as the amount of tetra-ethyl lead it contains is quite high compared to road vehicle requirements, even in "LL" form. The fuel system does get routinely inspected for adverse effects; none noted so far after a decade or so, although I do change the rubber hoses reasonably regularly, in any case.