Have it tuned mmp12!if you use oxygenated fuel it will mess with your air fuel that you have allready got a map or tuned allready!I run race fuel with either 2.8% or 3% 02 and had my bike dynod with it ages ago!Ive run it for years and never use service station fuel because it can be a lucky dip with quality!I could be wrong but think my tuner richened it up but dont quote me