Person A and person B live a street apart from one another. They both start a training course that is a 25 minute (20 miles) drive away from their home. It is 6 sessions over a 6 week period. Person B suggests maybe they car pool and take it in turns to drive each week. Person A says don’t worry, I will drive us every week. Person B asks if they’re sure, person A insists. Person A is a 2 car household whereas person B’s family share a car, so her husband and children would be left without a car on the days she is on the course if she drove. Not a huge deal, but nice to not put her DH in that position.
Person B insists they will help with petrol, and pay parking. Parking ends up only being £1 each session. How much is a reasonable contribution towards petrol each week?