My 200HP fuel injected Laser uses ~40liters per hour overall (Aeros and ferry flights avaeraged). Plus 8 liters of oil and a filter every 25 hrs. It burns/leaks/blows out 1 liter every 5 hours
Variable costs are ~£75 per hour (incl fuel & oil as above). Fixed costs are about £3000/yr but a new engine or prop can change these numbers. It also depends on hanagarage costs which are not includedd in the above numbers.
150 hrs per year is a good number that balances spreading the fixed costs vs aircraft availailability. Most people share to get this number.