18 to 24$ a gallon around here
depends on if your gogin to run 10 or 15% nitro

i beleive that plane has a 10 oz tank so one gallon is 12.8 refuels i easly do 14 minutes and ahve some left so 179.2 minutes per gallon (assumign you empty the tank in 14 minuts which would be alot of full power flying, not lickly when learning)

24/179.2 =~13 cents a minute your flying

So thats about the cost of fuel but i must warn you there will be other cost, such as glow plugs and such

Steven