I accidentally bought 25% airplane fuel instead of the 30% heli fuel. I noticed that it yields less smoke and less power but it runs pretty cool at ~190F
I've also noticed that after hovering for a couple minutes the rpm drops and the heli barely stays above ground.

Am I too lean or too rich?
Can this fuel damage my engine since it doesn't have as much lubricant as the heli fuel?

P.S. I'm currently just hovering with a hoola-hoop

Thanks