115/145 (purple) is like Jan... said, mostly for high performance engines, 100/130 (green) is the norm these days and I imagine what you have available. 80/87 (red), from what I have heard is a thing of the past, but common back when I worked line service "back in the olden days" ('66 thru '69 when private aviation was a lot busier than today). I was told back then that avgas is very high in lead content, so the post about 1/6 avgas to 5/6 unleaded, seems to make some sense. However, due to the different methods of obtaining octane, mixing does not always come out equal to the ratio of the fuels mixed... you can even mix one type of 87 with another type of 87 and end up with 88 or 89.
I sometimes mixed fuel we drained from the sumps on the fuel trucks with my car gas, but not enough to tell any difference. We did on occasion sell 100/130 to gas drag racers as they claimed it helped.
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