I have to retune my Aircraft engine once in a while depends on season. As with the Truggys yep all the time to keep them at peak. But car engines are usualy at a higher work load and RPM and peak out all the times.
I find a lot of car engines fail because of too lean at peaking, running without the air filter, not run in properly because they lost patiance trying to keep it going when it was easy to run them at peak...