Yesterday I went to the Sorel airport and tested the fuel in my Zenith 90 liters tank.

   This fuel already contains two stroke oil in the ratio of 1:130 per volume.

In a cylindrical ungraduated container I poured 25 ml of tap water and added 200 ml of fuel

After  1 hour and several vigourous shakings I observed an increase in the volume of water to 40 ml

The increase is about 4% (?)

All quantities are approximate.

Since I began running and flying my 1986 Mazda 13B engine, I have tested in flight all grades of mogas and also 100LL avgas. I would wait until my fuel level was very low and would fill my tank with the différent grade. Never detected a change in the performance of my engine. The only times I drew water from my fuel tank was when it was filled with 100LL avgas.

Yvon Cournoyer.