The Byrons 25% ¨Race¨blend fuel (11% oil) you have will be fine for play or racing.
Byrons also make the ¨Pro Driver¨ blend which is 9% oil, and more of a serious racer fuel, but can also be used equally as well for play.

If your new to nitro stick with the 11% blend for a while until your tuning skills develop. The 11% just gives you the extra lee-way should something go astray in the tuning department

Byrons Gen2 Race or Pro Driver blends are excellent fuels.
We stock Byrons and recommend it to all our customers.