Hi sopwith, most valuable info you share with us above. I sure admire your systematic approach to the use of E85 and you certainly changed my earlier misconception about engines running (too) hot on E85....THANK YOU........I will try E85 again this coming season and make sure the engine(s) become hot enough to run well. Do not know what could be a european equivalent to the Thunderbolt plug you used..?..any ideas..? I will try E85 on my 4S Saito engines as before...Cheers/Harald