Personally, I'd say the placard is all you need, but only if you are sure
the STC for a plane like yours is just a paper whipping excercise. If so,
I'm sure you don't even need the placard to fly on autofuel.

These autofuel STCs that are nothing more than an Adel clamp and a placard
have an "Alice in Wonderland" feel to me.

"Al Gilson" wrote in message
...
Our 1964 Skyhawk has a placard by the fuel cap indicating that it is
approved for unleaded auto fuel. However, I don't have any paperwork
showing that it has an STC for autofuel. Any ideas on how I could
research this information? Or...is the placard all I need?

Thanks.

--
Al Gilson
Spokane, WA USA
1970 VW Convertible
1964 Cessna Skyhawk