Lexus RX300 Manual page 260

Gasolines containing MTBE
Gasolines that contain MTBE (Methyl Tertiary–Butyl Ether)
are available in the market. If you use a gasoline mixed with
MTBE, make certain that it does not contain more than 15% of
MTBE.
If the use of gasolines containing MTBE causes poor drivability
and/or poor fuel economy, you should stop using them.
Gasolines containing MMT
Some gasolines contain an octane–enhancing additive called
MMT (methylcyclopentadienyl manganese tricarbonyl).
Lexus does not recommend the use of gasolines that contain MMT.
If fuels containing MMT are used, your emission control system may
be adversely affected. The Malfunction Indicator Lamp on the
instrument cluster may come on. If this happens, contact your Lexus
dealer for service.
Gasolines containing alcohol
Gasohol is a mixture of gasoline and ethanol. If you use gasohol
in your Lexus, be sure that it is unleaded, has an octane rating
no lower than 87 and does not contain more than 10% ethanol.
Lexus does not recommend the use of gasolines containing
methanol.
If you use gasoline containing methanol, use only gasoline meeting
the requirements above and also containing less than 5% methanol
with cosolvents and corrosion inhibitors for methanol.
NOTICE
D Do not use gasohol other than stated above. It will cause fuel
system damage or vehicle performance problems.
D If drivability problems are encountered (poor hot starting,
vaporizing, engine knock, etc.), discontinue its use.
D Take care not to spill gasohol during refueling. Gasohol may
cause paint damage.
Fuel tank capacity
65 L (17.2 gal., 14.3 lmp.gal.)
ENGINE
245