The EN228 petrol standard, which is approved for the engine, allows bio-based components. However, in the US, bio-based gasoline may have a different chemical composition than in the EU (it is a different standard), and such gasoline has never been tested here.
Unfortunately, bio-ingredients are highly variable in composition (they can be of different origins), are volatile (they separate) and bind water (shelf life).In general, therefore, we recommend that you ideally use gasoline without bio-ingredients (Ethanol) for your engine - but such gasoline may no longer be available in some countries.
Warning note: Just because an engine is approved for automobile gasoline according to EN228 does not mean that the whole aircraft is approved for it (this is up to the aircraft manufacturer, as there may arise problems unrelated to the engine - e.g. rubber parts/hoses of the airframe). Do you know what kind of gasoline this plane flew on in Germany? Automobile in Germany (EU) can also contain bio-ingredients (Ethanol / or other alcohol).
There will be a bulletin coming out soon approving UL91 and UL94 gasoline for our engines according to ASTM D7547 We consider these gasolines to be a better alternative than automobile gasoline with bio-ingredients.
With best regardsJan Tomsa - Sales manager
For what it is worth (probably not much) I have been running 87 octane unleaded car fuel (with and without ethanol) in my LOM Jungmann for twelve years without the slightest problem. Taking advice from those who know far more about this stuff than me I typically use about one tank of 100LL aviation fuel for every two or three tanks of 87 octane unleaded. The theory is that while 100LL has far too much lead for the engine (and the environment) 87 octane has too little. Using some of both supposedly works out about right.It is worth noting, however, that my fuel system is 100% metal with no rubber or plastic parts and I rarely, if ever fly above 3,500' MSL. The climate is mild.
Of course it doesn't hurt that where I live 87 octane fuel is currently +/- $2.75/gallon or €0.67/liter :)