Triumph Rocket III Service Manual page 167

Fuel System/Engine Management
Fuel Requirements
Fuel Requirements - all countries except USA
Outside America, the Rocket III must be run on 95
RON unleaded fuel.
Fuel Requirements - USA
In the United States of America where the octane
rating of fuel is measured in a different way, the
following information may be applied: the Rocket III is
designed to run on unleaded gasoline with a CLC or
AKI octane rating (R+M)/2 of 89 or higher.
The use of leaded gasoline is illegal in some
countries, states or territories and will invalidate the
vehicle and emissions control warranties.
Additionally, leaded gasoline will cause damage to
emissions control components
Oxygenated Gasoline
To help in meeting clean air standards, some areas of
the U.S. use oxygenated gasoline to help reduce
harmful emissions. The Rocket III will give best
performance when using unleaded gasoline.
However, 'the following should be used as a guide to
the use of oxygenated fuels.
Because of the generally higher volatility of
oxygenated fuels, starting, engine response and fuel
consumption may be adversely affected by their
use. Should any of these difficulties be
experienced, run the motorcycle on normal
unleaded gasoline.
Ethanol
Ethanol fuel is a mixture of 10% ethanol and 90%
gasoline and is often described under the names
'gasohol', 'ethanol enhanced', or 'contains ethanol'.
This fuel may be used in Triumph motorcycles.
Methanol
Fuels containing methanol should not be used in
Triumph motorcycles as damage to components in
the fuel system can be caused by contact with
methanol.
MTBE (Methyl Tertiary Butyl Ether)
The use of gasolines containing up to 15%
MTBE (Methyl Tertiary Butyl Ether) is permitted in
Triumph motorcycles.
Service Manual - Rocket III
11.13