915iS Fuel

Glenn Mathis wrote:

I always "heavy" up my fuel trailer in the spring with 10-20% 100LL. This helps keep the fuel from boiling in the lines before all the "winter blend" fuel has been used up from the previous winter months. Since the amount of 100LL is so small the amount of lead doing this is also quite a bit smaller per volume. A win in my column. And if you're using E10, this also reduces the ethanol content per volume as well.

Plus it adds to the octane. Even though Rotax specifies minimum octane at 91AKI, I'm sure you can tell that they run much smoother with 100LL in them.

Can't wait until they get the 100 no lead into the supply chain!

Adding 10-20% 100LL may not be enough to protect you. I have had vapor lock in spring with a mix of 50% 100LL and 50% winter blend mogas. I now use 100% 100LL in spring until I know the winter blend is gone from the pumps (June 1 in the US).