HS250h takes 87 Octane?
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Driver School Candidate
Joined: Jun 2009
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From: Newport Coast, CA
HS250h takes 87 Octane?
Is it true that the HS recommended fuel is standard 87 Octane?
Is it because it's somewhat of a glorified Prius?
Or is it because Toyota's engines are in Lexus's Vehicles?
Is it because it's somewhat of a glorified Prius?
Or is it because Toyota's engines are in Lexus's Vehicles?
Driver School Candidate
Joined: Dec 2005
Posts: 4
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From: IA
87 Octane - Atkinson engine
The HS engine is a so-called "Atkinson cycle" engine, like the Prius. Keep in mind that the analogy is best served as a "glorified Camry hybrid" rather than a "glorified Prius" as the HS shares the same gasoline engine as the Camry hybrid.
Running a higher octane fuel in the HS will not get you better mileage or performance. The engine is not designed to adjust timing based on octane like all other non-Atkinson Toyota/Lexus engines. While all other Lexus vehicles state that premium fuel is required, you can still use regular 87 octane gas and the fuel sensor will adjust the timing to compensate for the lower octane, resulting in a marginal loss of HP and economy. The inverse is true for all Toyota engines from about 2005 and on: while 87 octane is recommended, putting in premium fuel will result in marginally higher economy and HP.
Source: me. I work for Lexus and Toyota.
Running a higher octane fuel in the HS will not get you better mileage or performance. The engine is not designed to adjust timing based on octane like all other non-Atkinson Toyota/Lexus engines. While all other Lexus vehicles state that premium fuel is required, you can still use regular 87 octane gas and the fuel sensor will adjust the timing to compensate for the lower octane, resulting in a marginal loss of HP and economy. The inverse is true for all Toyota engines from about 2005 and on: while 87 octane is recommended, putting in premium fuel will result in marginally higher economy and HP.
Source: me. I work for Lexus and Toyota.
Hacked CL to become a Mod
Joined: Jun 2007
Posts: 6,713
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From: Vancouver >> Hong Kong
yes this octane rating thing has been done to death already, putting more is not going to give you any benefit.
I would suspect that it runs on 87...kinda pointless to have an economical car that uses premium
I would suspect that it runs on 87...kinda pointless to have an economical car that uses premium
Pole Position
Joined: Sep 2004
Posts: 221
Likes: 42
From: North Carolina
Kurticus, one of the reasons I'm considering the HS is founded on 2 issues: (1) I drive an '08 RX350. During a gas crisis several months ago, you couldn't obtain premium fuel in NC for several weeks. So I fear the same thing may occur in the future (Iran, global recession blah blah). (2) Although I know I could use 87 octane in the RX, I've been told by several people that eventually it will cause the RX to have engine problems, which Lexus will discover during repair; they will know I've been running it on regular gas, which will then void my warranty.
Any truth to the engine problems/voiding of warranty if using regular?
Any truth to the engine problems/voiding of warranty if using regular?
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