Hi,
I think it would be a good idea to earn extra points for updating fuel prices that are long out of date.

For example. Petrol station 1 - fuel prices updated 1 days before - you update them again and you earn 8 points.

Petrol station 2 - fuel prices updated 10 days before - you update them again and you earn 80 points.

Petrol station 3 - fuel prices updated 100 days before - you update them again and you earn 800 points.

This will make users add the correct fuel prices more often to gain more points.

Every one wins.... the updater.. getting more points for going out of their way to update fuel and the drivers as we get accurate fuel prices.

Result!