After playing with the figures;
Driving a car
Chance is .85 per 1000000 hours = 0.00000085 per hour
Average driver does 10,000 miles per year @ average speed of 50 = 200 hours in the car giving a risk of 0.00000085 * 200 hours = 0.00017
Flying a light aircraft
Chance is 16 per 1000000 hours = 0.000016 per hour
Average 12 hours flying per year for average PPL giving a risk of 0.000016 * 12 = 0.000192
Overall difference is f1.129 making flying slightly more risky.
Riding a motorcycle is '33 times' more risky than driving a car making it more dangerous than flying.
But then these figures are produced from total data. Correct attention to your attitude and behaviour whilst partaking of any such activity will significantly reduce your chance of becoming a statistic.
How does your personal risk factor compute?