I'm not familiar with the specific model of seaplane referenced here, but 100LL avgas is commonly used in small planes (and the LL stands for low-lead) https:/

I'm not familiar with the specific model of seaplane referenced here, but 100LL avgas is commonly used in small planes (and the LL stands for low-lead) https://en.wikipedia.org/wiki/Avgas https://en.wikipedia.org/wiki/Avgas