External Operations Fuel Requirement - Lotus 2005 Elise Owner's Handbook Manual

EXTERNAL OPERATIONS
Fuel Requirement
USE UNLEADED PREMIUM GRADE GASOLINE.
Use only unleaded gasoline meeting ASTM specifications.
Use of fuels not meeting ASTM specifications could cause poor
performance and increase emissions.
For optimum car performance and fuel economy, the use
of super or premium unleaded gasoline, with a minimum
octane rating of 91 (RON+MON)/2 is recommended. Where
super or premium fuel is not available, the Elise will operate
satisfactorily on unleaded gasoline having a minimum rating
of 87 (RON+MON)/2, but car performance and economy will
be reduced.
Using fuel with a lower octane rating may cause knocking
(pinking) which, if severe, can cause serious engine damage.
Light knocking may occasionally be heard for short periods when
accelerating or driving up hills, and this should cause no concern,
although using a lower gear would be advised. If, however, you
hear persistent heavy knocking when using the specified fuel,
consult your dealer without delay.
The use of good quality fuels containing proper detergent ad-
ditives is advised for good performance and emission control.
NOTICE: Do NOT use leaded fuel: damage caused by the use
of leaded or other improper fuel is not covered by the New Car
or Emission Control System Warranty. The effectiveness of
the catalytic converter decreases after as little as one tankful
of leaded fuel. Also, the car is fitted with a fuel injection system
which includes an oxygen sensor. Leaded fuel will damage the
sensor, and cause emission control to deteriorate.
Gasolines Containing Alcohol - Some gasolines sold at service
stations contain alcohol although they may not be so identified.
Use of fuels containing alcohol is not recommended, unless the
nature of the blend can be determined as being satisfactory.
Gasohol - A mixture of 10% ethanol (grain alcohol) and 90%
unleaded gasoline may be used in the Lotus Elise. If driveabil-
ity problems are experienced as a result of using gasohol, it is
recommended that the car is operated on gasoline.
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