I'm in a well run (not by me) syndicate of 17 running a 28-161. The aircraft flies about 400 hrs PA.
We're paying £30/month, fixed costs. £5 of that is admin overheards, so that makes fixed costs about £425/month. About half of that will be hangerage.
We're paying £50hr variable costs. It averages a fuel burn of about 32 litres/hr which would be £30/hr in fuel, so about £20/hr in all other costs.
So, it looks to me like:-
£2500 fixed costs
+ whatever deal you can get for hangerage.
+ Fuel at around £30/hr
+ other "hour dependent" costs at around £20/hr.
You'd have to talk to our syndicate accountant to get the fine detail, but I think that this pretty much sums it up.
G