Good luck with the silicone. It's not hard to mix if you know the viscosity of the two oils. You can mix and get any value you want.
[link=http://www.gesilicones.com/gesilwizards/blending/fluid2.html?SMSESSION=NO]Link - Here is a calculator you can use.[/link]

I used to mix my own fuel too. That's not rocket science either and I would still do it if I had a suitable space to mix and store any bigger quantities of fuel.

I am also tired of all 'best engine...', 'best buggy...' threads. More crazy projects plz.