I can only speak for myself and maybe one other friend, we both own the same type, which is a permit aircraft and are quite thirsty, we can only run on avgas.
Whilst our fixed operating costs have remained pretty much the same for the last 2 years, fuel hasn't, and so for that reason we have flown less hours this year.
Whilst the oil price is about 20% down on this time last year avgas just keeps on getting more expensive, why? it makes no sense! I'm rapidly approaching the limit for what I'm prepared or indeed can afford to pay for an hours flying and to do enough hours to feel comfortably current.