The Yak 52 I fly is £60 a month, plus £60 an hour dry, plus landing fee. I have no problem with this. The aircraft has automatic mixture control anyway. Depending on what you do the fuel burn can be from about 60 litres to 100 litres an hour, so the fairest way of doing things is to fill up with 100LL and top up the oil when you finish. The system works very well as you always start with full tanks so there is no argument.
Other prices I pay:
Arrow II £135 an hour wet (chock to chock) and including home base landings
Bulldog £118 an hour wet (tacho)
RD