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Methanol blends
As shown previously, the U.S. Environmental Protection Agency’s (EPA) substantially similar provisions allow methanol content of:
    •Up to 0.3% v/v, or up to 2.75% v/v with an equal volume of butanol, or higher molecular weight alcohol
    •Up to of 5% v/v, with a minimum 2.5% v/v co-solvents (defined as one or a mixture of higher alcohols including ethanol, propanols, butanols and pentanols), per the octamix section 211(f)(4) waiver
ASTM International has issued the standard ASTM D5797 for Methanol Fuel Blends (M51–M85) used in methanol-capable automotive spark-ignition engines. This standard includes recommended parameters and limits for higher methanol blends as follows:
ASTM D 5797 Methanol Fuel Blends (M51–M85) for Methanol-Capable Automotive Spark-Ignition Engines specification
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Methanol blends