"One of the primary concerns associated with alcohol in fuel is that it can be aggressive to the elastomer's, seals, and diaphragms used in fuel systems, causing them to fail unless the entire fuel system from tank to engine was originally designed for ethanol. The presence of alcohol not only affects fuel tank linings, but also components within the carburettor or fuel injection system" "Alcohol is used not just to increase the amount of bio-component in gasoline, it also contributes to the octane performance of the finished product. Combining water with fuels that contain alcohol will tend to remove the alcohol into the water phase. The removal of alcohol in this way decreases the octane availability in the remaining fuel and potentially takes it below the octane requirements of the engine" "No doubt you will be aware that there is a lot of pressure on reducing greenhouse gas emissions throughout all areas of the energy sector. For this reason, many governments have issued either legislation or targets to include bio-components ito ground fuels" What is interesting about these quotes is that they are from a publication I have just received called 'Tech Talk' which is published by Shell Aviation. It seems the fuel companies themselves are not that keen on ethanol, but are being backed into a corner for purely political reasons. The bottom line of the article was 'dont use it in your aero engine, you'll break it'......so I for one ain't gonna use it my bike either. EDIT - They were talking about just 1% ethanol by the way!