There is no reason to run AVGAS in yout DA50. Low lead in the aviation world means tons of lead in the automobile world. Lead in used to get the octane way up there around 105-110 in automotive terms. Lead is also good for valve seats. AVGAS also has a lower specific gravity which is like saying it's less dense. That means it runs leaner per volume. High octane causes a slower flame front or a slower burn of the combustion mixture. In a two-stroke engine where the intake and exhuast happen on one up stroke and then one down stroke slow combustion is not what you want.

What happens in the real world is that people try AVGAS and due to the lower specific gravity it runs leaner and people think that because it's crisper in response and pulls a few more RPM it must be better. What's really happening is that there engine is running leaner. You would be better served twiddling your needle valves yourself on 91-92 octane automotive fuel. No lead worries, faster flame front, less cost and no carbon build-up problems. OK, AVGAS does smell sweet when burning, I'll give it that!