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 fatalit

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.