[oldgradstudent]

Assuming all hours were flown at Cessna 172 cruise speed of 140mph, that gives about 2e7 * 140 = 2.8e9, divided by 332 gives about 8.4 million miles per fatality.

Compared to 85 million miles travelled per fatality on the roads in general, and about 4 million miles travelled per fatality on motorcycles.

2X better than motorcycles, 10X worse than road fatalities in general.

And that's being quite generous about the mileage.

[anamexis]

I don't think miles travelled per fatality is a useful point of comparison for general aviation. This puts it about on par with pedestrian deaths per mile travelled, and I don't think most people would call walking "extremely dangerous."