I read this question:
And I thought, maybe I don't pay my rideshare enough... Not the premise of that question, but it raised this question to me.
Taking into consideration:
I would take public transport if not for being offered a lift which mean ridesharing saves me $a per day.
Ridesharing gets me home around b minutes earlier.
I jump out along the way which means there are c meters of extra distance due to me.
The drive is long - d minutes, so that is certainly a factor.
We have a similar level role - grunts. But that should probably be taken into account - perhaps e pay difference.
What is a good way to calculate the amount to offer a colleague who driveshares with me accounting for a, b c, d, e and the x factor which would probably be friendship?