Only certain airframe and engine combinations are allowed to use Mogas.
As the Europa is on a permit to fly the PFA is the club which can give you conclusive guidance on whether that is permitted for that combination.
Apart from this there are operative restrictions to the use of Mogas and guidance on how to handle the stuff safely. There is a safety leaflet issued by the CAA on this particular subject which is 'compulsory' reading material if you go down this route.
Have a look on the CAA website for it or in your local flying club.
FD