Manuell Service says......"Use only unleaded gasoline of at least 87 pump octane(R/2+M/2) or 91 octane or higher if rated buy the research method. Gasoline containing MTBE (Methyl Tertiary Butyl Ether), less than 10% ethanol, or less than5% methanol with appropriate co-solvents and corrosion inhibitor is permissible".
Manuell Owners says........"Your motorcycle requires regular unleaded gasoline with a minimum pump octane rating of 87 (R+M)/2 method) In some areas the only fuels that are available are oxygenated fuels.
Oxygenated fuels which meet the minimum octane requirement and the requirements described below my be used in your motorcycle without jeopardizing the New Vehicle Limited Warranty or the emission Control System Warranty.
NOTE: Oxygenated fuels are fuels which contain oxygen-carrying additives such as MTBE or alcohol.Gasoline containing MTBEUnleaded gasoline containing MTBE (Mettyl Tertiary Butyl Ether) may be used in your motorcycle if the MTBE content is not greater than 15%
This oxygenated fuel does not contain alcohol.
Gasoline/Ethanol BlendsBlends of unleaded gasoline and ethanol (grain alcohol), also known as "GASOHOL", may be used in your vehicle if the ethanol content is not greater than 10%.
Gasoline/Methanol BlendsFuel containing 5% or less methanol (wood alcohol) may be suitable for use in your motorcycle if they contain co-solvents and corrosion inhibitors.DO NOT USE fuels containing more than 5% methanol under any circumstances. Fuel system damage or motorcycle performance problems resulting from the use of such fuels are not the responsibility of Suzuki and may not be covered under the New Vehicle Limited Warranty or the Emission Control System Warranty."
NOTE:
To help clean the air Suzuki recommends that you use the oxygenated fuels. So Manuell says.