So while I was doing some two stroke oil research I came across some people claiming that it's a good idea to add marine two stroke oil (TC-W3) to the fuel tank of your car. They claim it has all sorts of benefits including "smoother running engine/more power/better MPG"
They say to add one ounce to 4/5 gallons of fuel
Idk, wild stuff, but it kind of makes sense, I just thought it would be great to get people who are so familiar with 2cycle engines, and oils take on it.
Here are some links about it.