Comment by ferguess_k

How about per fly versus per drive? This weeds out two issues:

- Most people don't fly often enough to justify Statistics significance (I for one only flied maybe less than 10 flights in my whole life)

- One flight is going to cover a huge amount of mileage anyway

Edit: Just realized that issue 1 is not an issue, we are going to do an average here anyway, so not individual.