The "sport" is what I used to run in my bashers; it is too high of oil content which resulted in gummed up and slipping one way bearings. I had to disassemble and clean the engine thoroughly every 6mo to prevent the slipping (actually, I probably had to clean the OWB more often). The "sport" is by no means a sport blend at all; just a cheap blend marketed for the bashers.

I never used the race blend; but if it is actuall $2-3 more, it better ontain way less oil and be actually bleneded to compete with other race proven fuels such as Byrons.