0.16 and 0.20 per mile
Do you subtract the cost of resale? Seems appropriate.
2 bikes
1) Orbea road bike $1700 invested, plan to sell for around $800: Total cost = 900
5500 miles
$0.16/mile
2) Kona Jake the Snake cyclocross $2250 invested, plan to sell for $500: Total cost -= $1750
Total 8500 miles since 2014
$.20/ mile
Costs of cycling clothes, computers, shoes etc could add around $0.10/mile