I was out bashing the other day and I accidently grabbed my friends 16% nitro fuel instead of my 20% (bottles were close together). It was only half a tank that I went through before the penny dropped (my friend noticed his bottle was a bit empty). I tipped out the remainder of 16% even though the car ran fine. Was wondering will this cause problems for my motor ???? I frikken hope not !!!! Probably should have checked before fueling up Hey !! I'm an idiot. LOL