Mixing Mogas and Avgas

[Blue Albatross]

This might sound like a moronic question, so forgive me in advance.

My plane is certified to fly on both Avgas and Mogas. I am wondering if it is safe or unsafe to mix fuel types in the tanks.

For instance, I fill up on Mogas, stop and refuel with Avgas (because it's all that's available on the field).

Can this mixing cause problems either with the tanks, tubing or within the engine itself?

Thanks