Both the popular Autofuel STCs allow any mixture of 100LL and (allowable) AutoGas. I've never heard of it being a problem. As Dana and Ron said, the biggest issue is that 100LL will lead choke an engine that was expecting 80.
Both the popular Autofuel STCs allow any mixture of 100LL and (allowable) AutoGas. I've never heard of it being a problem. As Dana and Ron said, the biggest issue is that 100LL will lead choke an engine that was expecting 80.