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09-27-09, 04:23 PM
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#1
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Driver School Candidate
Join Date: Jun 2009
Location: Newport Coast, CA
Posts: 16
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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?
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09-27-09, 05:55 PM
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#2
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Lexus Champion
Join Date: Oct 2003
Location: California
Posts: 2,640
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On the HS 250h brochure it does state for the fuel requirement of regular unleaded, 87 octane but I'm sure it'll run better with premium unleaded gas...
__________________
 1998 Red SC 400 - Gone but definitely not forgotten
 1996 Blue GS 300 - Gone but not forgotten
 1996 Classic Green Pearl ES 300 - 380,000+ miles
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09-28-09, 06:50 AM
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#3
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Driver School Candidate
Join Date: Sep 2009
Location: MD
Posts: 18
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yes sir it runs on 87
__________________
Im your hook up for OEM Lexus parts. 
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10-20-09, 01:12 PM
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#4
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Driver School Candidate
Join Date: Dec 2005
Location: IA
Posts: 4
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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.
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10-20-09, 10:57 PM
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#5
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Lexus Champion
1993 Lexus SC
Join Date: Jun 2007
Location: BBC
Posts: 4,377
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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
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10-21-09, 07:23 PM
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#6
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Rookie
Join Date: Sep 2004
Location: North Carolina
Posts: 58
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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?
__________________
johnnyM
'08 RX350
[previous Lexi ==>'06 GS300, '05 RX330, '01 GS300, '97 SC300, '92 SC300]
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10-24-09, 04:49 AM
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#7
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Rookie
Join Date: Jan 2003
Location: GA
Posts: 53
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Once again, running regular unleaded in your 08 RX isn't the end of the world.
__________________
92 SC 300 5 Speed 190,xxx miles...Wife would kill me if I sold it. 
98 GS400 just added to the fold..
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11-04-09, 11:16 AM
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#8
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Pole Position
Join Date: Mar 2008
Location: Connecticut
Posts: 313
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why complain about 87? what you want it to run on 93? my only options here are 87 89 and 93 in CT. and lexus recommands i run 93 in my is350
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Tags
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2007, 250h, 87octane, club, es, forums, fuel, grade, hs, hs250h, lexus, premium, require, user, ushs250h  |
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