Yes I understand exactly what you are saying Dick, I only run a couple of .46 size planes at the moment, and my pocket is already hurting from the cost of fuel. ( I have a strip at my house and fly alot).

And I have been wondering how I could ever afford to opperate a ys 140 dz powered plane? Other than the astronomical upfront cost of this type of plane, the fuel bill would be outrageous, especially with all that nitro.

Sounds to me like a gasser is the way to go for me in the near future.
Lots of practice for not alot of dough.

What type of oil is commonly run in these gassers?

Robert , a 40cc ys !!!!!!!!!! That would be scary!!!!!!!!!!
Youd have to have a 44 gallon drum of fuel in your flight box!!!!!!
hehe.