Premium or Regular Gas ? - Page 10 - Club Lexus Forums

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View Poll Results: What gas do you use ?
Premium 428 82.31%
Midrange 36 6.92%
Regular 56 10.77%
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Premium or Regular Gas ?

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Old 07-21-14, 06:06 PM   #136
LexiTwo
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I always use 91 octane or 93 if in the US in my SC. I often use mid grade in my ES330 and premium occasionally. It has 250,000 Km (150,000 Miles) and runs like a top. I have been unable to see much difference in mileage.
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Old 08-04-14, 09:30 AM   #137
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always use regular
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Old 08-11-14, 01:52 PM   #138
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from what i am told, unless your car specifically requires high octane fuel, there is no point using it unless you want to just spend more money
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Old 09-01-14, 08:10 PM   #139
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On the ES it says to use premium 91 octane or better. Different regions of the US offer different octane values for regular, mid-grade and premium because you cannot get the same octane value in the Rocky Mountains that you can get on the California coast. If you want the fuel economy and/or performance on higher compression vehicles: such as Lexus, then you should not ever use less than what the posted octane values on the pump meets or exceeds what Lexus says is for your vehicle in whatever region you are fueling up in.
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Old 09-19-14, 10:06 AM   #140
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Premium always unless i'm riding in the honda then it is regular all the way
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Old 11-20-14, 06:40 AM   #141
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I drive so few miles that the extra cost for Premium doesn't hurt.
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Old 12-12-14, 08:02 AM   #142
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I've always used premium in vehicles that "require" it. I had a 350Z that I tried using regular or midgrade in and it would knock weird, so stuck with premium from then on.
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Old 01-05-15, 03:16 PM   #143
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You guys do realize that the 4GR FSE is the same engine that is used in the Mark X model in Japan, which is basically the Japanese version of the Toyota Camry. Now I wonder. What kind of fuel is used on a Toyota Camry??? Hmmm...
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Old 01-05-15, 03:42 PM   #144
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Premium in my Honda, regular in my ES330, and premium in the GS.
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Old 03-11-15, 10:52 AM   #145
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Default I use regular in my GX 460

Two reasons: In my local area There is available no-alcohol gas 87 octane. I would rather have real gas with no ethanol even if the octane is lower. If I owned an IS 350 with a 11.8 compression ratio maybe but the GX is 10.2 and it runs fine even under load.

We have to consider the role of a 26 year old Vassar grad with a Harvard law degree and her influence on this requirement. If testing revealed even an 1/8 of a mile per gallon increase for premium over regular then Lexus would require it to satisfy this learned EPA employee who would delay licensing for any tiny uptick in the Lexus overall mileage number.

This employee is also the reason I could not get a diesel. She thinks they are "stinky".
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Old 03-12-15, 07:12 AM   #146
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Quote:
Originally Posted by Aterrex View Post
My dealer told me to use onlypremium gasoline. Thats exactly what teh Toyota dealer told me to use on the Land Cruiser too( which I dont I use costco gas). But this IS seems like its a high performance car. Should I really only use premium gasoline only ? And what gas do you guys use ?
The manual for my IS-350 clearly states in the Specifications section that "if 91 octane gasoline is not available you may use gasoline with an octane of 87 (regular) or higher"

So the car accelerates faster with high octane fuel but it doesn't knock without it. Likely due to some kind of anti-knocking sensor/feature that adjusts the engine to prevent knocking. Google "premium gasoline scientific american" and "premium gasoline lifehacker" to read more on the difference between "recommended" and "required", etc
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Old 11-12-15, 11:21 AM   #147
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Only premium for my IS350. She deserves it!! Only the best for her always!
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Old 11-14-15, 12:25 AM   #148
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My RC350 calls for Premium and that's what she gets. I've done a lot of research regarding gas quality, their refining process and which company has the most updated technology. And the winner is............ Shell. 93 octane from ONLY Shell stations is all I put in all my vehicles including my 98 Frontier which only ask for Regular unleaded. And my BMW K1300S appreciates the Premium fuel.
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Old 11-14-15, 03:25 PM   #149
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Quote:
Originally Posted by RoninAMG View Post
My RC350 calls for Premium and that's what she gets. I've done a lot of research regarding gas quality, their refining process and which company has the most updated technology. And the winner is............ Shell. 93 octane from ONLY Shell stations is all I put in all my vehicles including my 98 Frontier which only ask for Regular unleaded. And my BMW K1300S appreciates the Premium fuel.
Premium only for me also. I didn't know Shell was a superior brand.

Could you please post your research findings here.
Thanks.
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Old 11-18-15, 11:41 PM   #150
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Quote:
Originally Posted by tecman View Post
Premium only for me also. I didn't know Shell was a superior brand.

Could you please post your research findings here.
Thanks.
I couldn't find that exact link that discussed Shell and it's updated refining process. When I have time I'll dig a little deeper for it. Been working insane hours recently. But for now this link discusses top gasoline and some additional items which I think many of us will find interesting. Enjoy.... www.toptiergas.com
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