altitude-compensating

Many small recreational aircraft still use altitude-compensating carburetors that contain aneroids that act on needle valves to compensate for altitude.

Early aircraft mechanical fuel injection systems contained an altitude-compensating aneroid, but I doubt early automotive models did.

So, an old automobile retrofitted with an aircraft altitude-compensating carburetor may very well compensate for altitude better than an early fuel injected automobile.

Though, I assume only a handful of cars have ever been retrofitted with altitude-compensating carburetors.

Some Rotax two-stroke engines running pre-mix have been used in ultralight aircraft, so I think appropriately sized altitude-compensating carburetors designed to run a petrol-lubricant mixture may be commercially available.