Also flying clubs that charge fuel surcharges on top of the rental price. The price of 100LL/UL91 and Diesel(Jet A1) does not change massively between deliveries. Why not increase/decrease the aircraft rental price on a quarterly basis.
It changes sometimes daily and if your not on it and change the price that day you can end up loosing money on the day instead of making it.
Someschools have gone out of buisness due to not keeping up with price increases. Obviously if the price goes down delaying helps out but some customers are on it as soon as it happens as well moaning that the price hasn;t gone down with the fuel cost.
Personally I think a dry price with a public fuel charge is the way to go. And the daily price and fuel charge for a lesson is displayed.