I've got a question for you guys. My buddy got an ofna mutilator truggy,and it comes with the force 32 engine in it. It says to run 20% in it, but we can't really get 20% anywhere near where we live. We order all of our fuel in bulk and it's byron's 30%. Will he be alright to run 30% in it, or would he have to add some shims to it? If it does need shimed, what size should we use in it.