Lexus 2012 RX450h Owner's Manual page 142

1-6. Refueling
Fuel types
■
RX350
Unleaded gasoline (Octane rating 87 [Research Octane Number 91] or higher)
RX450h
Unleaded gasoline (Octane rating 91 [Research Octane Number 96] or higher)
Use of ethanol blended gasoline in a gasoline engine
■
DO NOT use gasoline
containing more than
10% ethanol.
(15% ethanol)
(50% ethanol)
(85% ethanol)
Make sure that the ethanol blended gasoline to be used has a suitable Research
●
Octane Number as outlined in "Fuel types".
142
Use only gasoline containing a maximum
●
of 10% ethanol.
DO NOT use any flex-fuel or gasoline that
could contain more than 10% ethanol,
including from any pump labeled E15, E30,
E50, E85 (which are only some examples
of fuel containing more than 10% ethanol).