My estimate on 150 costs (not hard but good ballpark):based on 10 hours/month flying.
MX and eng reserve = 20/hr
fuel = 4/gal
burn = 6gal/hr
I plan to buy one without taking a loan so no payment if factored:
NO Hangar - will use outside tiedown and have canvas cover.
tiedown (Philly area) - $80
fuel = 10X6X4=$240
MX = 20X10=$200
total = 520/month or $52/hr - (I pay 77/hr for the 152 I rent at this time.)
MX at 200 per month is 2400 per year for anual, basic needs and $$$ in the bank for eng. overhaul. I figure on buying a mid time engine 150 so at 100 hours per year it will be about 10 years until the engine needs and overhaul (crossing fingers). If I can keep the anual and other MX to $750-$1500 per year I'll save about $1000 per year to put away for the overhaul by the time it needs it.
O sh!t I forgot insurance, If I remember correctly I was quoted about 2 years ago at 750 for the year. 750/12= 63
63+520 = 585 or about 60 bucks per hour to own my 150.
Not to bad for a hobby/excuse to hang with your local airport friends/bums. My other hobby is cycling and I usually spend about 150/month on that. A good day is ride to the airport, hang out, fly with friends to get something to eat, fly back, ride home and toss something on the grill.