Years ago, I would use a little gasoline to start the brush pile burning. I considered it on the dangerous side for it would go up all at once in the area where I poured it. Whoop!
A couple years ago I had been using #1 kerosene to start the brush fires and to clean chainsaw parts in. Kerosene works much better than gasoline for starting fires as the fire starts just where you have the kerosene.
One day I had drained some gas mix from a big chainsaw and I mixed it with some kerosene that I had been cleaning parts in. I think there was a little bar oil in it to? A few days later I poured the waste mixture on the brush pile and threw a match at it. That was a bad start. The mixture burned all over at combustion (explosion) and set everything in the brush pile on fire at once. The gas/kerosene mixture spread itself all over the brush although I had just put it in one area.
So I consider gasoline mixed with Diesel, Kerosene, ATF, bar oil, or motor oil to be some dangerous stuff. I would never run any gasoline in the bar oil tank. Not even just a little bit!