oil any good synthetic- the AMSOIL which many flyers use is quite inexpensive.
A gallon of fuel mixed up is under 3bucks
One gallon of gasoline -- 3 ozs of oil
128 ozs in a quart
so figure 60cents for oil and 1.50 for the gasoline = $2.10
Even if gasoline doubles and oil doubles - that's 4.20- as a goofy example.
My 40 CC ZDZRE pulls a special 20x10 prop - on a pipe in the mid 6000 range - (an ordinary 20x10 - in the 7000 range)
and I can fly for 11 min on about 12 ozs of fuel - I am throttled waaay back a lot .
Power is only added on uplines
On stuff like double vertical snaps - I use full power and the plane actually accelerates out of them.
Again - why would I want to go back---