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Old 07-01-10, 07:49 PM   #1
pierpark
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Default Premium Gas vs. Regular

I have a 2005 GX and it takes regular gas. I just picked up the 2010 GX today and noticed that it said to use premium only. Anyone using less than premium?

Thanks!
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Old 07-01-10, 09:32 PM   #2
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Originally Posted by pierpark View Post
I have a 2005 GX and it takes regular gas. I just picked up the 2010 GX today and noticed that it said to use premium only. Anyone using less than premium?

Thanks!
Probably you can, but would you risk it when the cost difference is less than 10%. With amount of gas the truck uses you will have to take an additional loan anyway to be able to drive it. My millage is terrible
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Old 07-01-10, 09:53 PM   #3
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This article makes the most sense out of what's out there.
http://www99.epinions.com/content_2346164356
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Old 07-02-10, 09:27 AM   #4
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I only use premium! For me it is piece of mind knowing that my truck is running on the good stuff
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Old 07-02-10, 10:12 AM   #5
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Default Thanks!!

Thanks for the feedback. I was just surprised when I popped open the tank and saw premium after loving 5 years of regular. I agree it is piece of mind to use the premium.
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Old 07-02-10, 07:07 PM   #6
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Quote:
Originally Posted by pierpark View Post
I have a 2005 GX and it takes regular gas. I just picked up the 2010 GX today and noticed that it said to use premium only. Anyone using less than premium?

Thanks!
I believe all Lexus from 2000 use premium... so far as I know... but car runs on premium can take regular too, just not good to the engine for long term and have less power and low performance
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Old 07-20-10, 02:16 AM   #7
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im kinda trolling in the GX forums haha but also keep in mind you'll get more mpg out of premium than regular... reason being regular contains ethanol to reduce emissions. Ethanol doesnt burn as efficiently as gas, so it burns more going 1mile than it would burn gasoline. Premium fuels dont have ethanol. Well at least this is how it is in canada, not sure if the premiums have ethanol down in the states or not.
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Old 07-20-10, 04:21 AM   #8
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I just read that the 2011 ES350 will be rated for regular fuel. The hp/tq numbers quoted were the same as for the Toyota Camry motor. I wonder if other Lexus models will do the same.
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Old 07-20-10, 06:23 AM   #9
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Let me start by saying that I am using Premium gas for piece of mind. Price difference is too small and I needed to take 2nd morgage on my car anyway to be able to drive since the millage is terrible

To add to the conversation and a little Toyota/Lexus conspiracy.

I think that you can drive without any problems on a regular gas, but the miles/gallon will drop a small %. Toyota/Lexus to increase the CAFE reported to the Federal Government, have started to require the Premium gas to report a better fuel efficiency. The is the same reason why they have moved to 0W-20 engine oil and increased oil change intervals.
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Old 07-20-10, 09:31 AM   #10
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They increased oil change intervals to compete with the other vehicle manufactures.
BMW has 15,000 mile oil changes, or once a year...
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Old 07-20-10, 11:43 AM   #11
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Quote:
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They increased oil change intervals to compete with the other vehicle manufactures.
BMW has 15,000 mile oil changes, or once a year...
Competiing with others is a BS. They want to get on the money wagon. I have just sold my 09 335i. They do the 15k as it is easy $$$ for them. The only place where you can change the oil is BMW dealer and it costs almost $300. While under waranty they change it for free, after that you are screwed + the car is not reliable. It is manufacturer way to make a buck and the customer is getting rear ended
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Old 07-20-10, 02:40 PM   #12
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Competiing with others is a BS. They want to get on the money wagon. I have just sold my 09 335i. They do the 15k as it is easy $$$ for them. The only place where you can change the oil is BMW dealer and it costs almost $300. While under waranty they change it for free, after that you are screwed + the car is not reliable. It is manufacturer way to make a buck and the customer is getting rear ended
I traded in my 2009 BMW X5 twin turbo diesel for my GX 460...
I won't buy another BMW ever. My X5 was a lemon. That was my 4th and last BMW. I waited months for parts to repair a brand new vehicle. The electronics were junk as well...
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Old 07-21-10, 09:56 PM   #13
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Compression ratio on the 4.7 is 10 to 1, the 4.6 is a more advanced engine with a compression ratio of 10.2 to 1, the old school method of choosing gas use to be by compression ratio, both engines should run on premium but thanks to modern ECU that can retard and advance timing, the engine is protect if constantly ran on regular.

But it should clearly be ran on premium, even if the toyota counterparts with the same engine can run regular, thats usually what Lexus owners do, default to the toyota with the same engine
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Old 07-29-12, 05:38 AM   #14
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Default Premium fuel????

New to forum. Sure this question discussed before but is premium fuel necessary. I have 2008 GX470 and been running 87 octane for a couple months. Haven't noticed any pinging or any significant changes in mileage or running. Are others doing this? Is this going to be harmful to vehicle longterm? I am aware the gas cap says premium fuel must be used.
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Old 07-29-12, 06:48 AM   #15
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A quick search will reveal at least a hundred threads regarding this...

long story short, it can cause detonation which wears the engine and causes poor power and fuel economy... (the computer senses the detonation and retards timing to compensate)

it costs $2-$3 on a complete fill up to use premium instead - you bought a luxury car, don't treat it like an econobox...

Last edited by mitsuguy; 07-29-12 at 06:57 AM.
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