Well I don’t know if your track sells pump gas, but if it does then you could use that. One of my local tracks sells spec 90 gas for $5 a gallon. Also check to see if your track requires a specific type of fuel, some tracks require specific fuels.
https://forums.kartpulse.com/t/fuel-for-lo-206/3241
Also check this discussion, they talk about some fuels for LO206. Hope this helps!