Mercury HP 500 EFI Bravo XR/XZ/III User Manual page 36

SPECIFICATIONS
USING REFORMULATED (OXYGENATED) GASOLINES (USA
ONLY)
This type of gasoline is required in certain areas of the US. The two
types of "oxygenates" used in these fuels are alcohol (Ethanol) or
Ether (MTBE or ETBE). If Ethanol is the "oxygenate" that is used in
the gasoline in your area, refer to "Gasolines Containing Alcohol"
also.
These "Reformulated Gasolines" are acceptable for use in your Mer-
Cruiser engine.
CA277hp
GASOLINES CONTAINING ALCOHOL
If the gasoline in your area contains either "methanol" (methyl
alcohol) or "ethanol" (ethyl alcohol), you should be aware of certain
adverse effects that can occur. These adverse effects are more
severe with "methanol". Increasing the percentage of alcohol in the
fuel can also worsen these adverse effects.
Some of these adverse effects are caused because the alcohol in the
gasoline can absorb moisture from the air, resulting in a separation
of the water/alcohol from the gasoline in the fuel tank.
The fuel system components on your MerCruiser engine will
withstand up to 10% alcohol content in the gasoline. We do not know
what percentage your boat's fuel system will withstand. Contact your
boat manufacturer for specific recommendations on the boats fuel
system components (fuel tanks, fuel lines, and fittings).
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32 500 EFI Bravo