The view from Europe and US
LAA Guidance in 2021 is clear. Refer to the Francis Donaldson article in the September 2021 LAA Light Aviation magazine. "Watch out". Reproduced here by kind permission or the LAA. The Europa receives special mention.
E10: The LAA does not approve the use of E10 rated Mogas. Your aircraft is not approved to use E10. (Consequently your aircraft insurance policy would likely be invalidated.)
E5: The LAA does permit some suitably modified Europas to use E5 rated Mogas, subject to detailed compliance with directives. However there may be long term implications for your aircraft that you ought consider.
UL91: The LAA promotes the use of AVGAS UL91
Test your fuel
Always test the fuel you buy with an ethanol tester.
Two types of tester:
Briggs & Stratton Tester:
Simple with Screw cap. Available from local Lawn mower suppliers.
Aviation tool, Daansen Combined Fuel Tester and - + Screwdriver:
No cap, use thumb if big enough, else you need to find a cap.
Available from Sportys USA
and Pooleys
https://www.pooleys.com/shop/pooleys/fuel-tester-and-cowling-screwdriver/
