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Do you need Premium Gas in the 2RX (merged discussion threads)

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Old 10-09-12, 12:53 PM   #541
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Hi bnewcol, the topic of what grade of gas to use has been discussed many many times on this forum, I would do the search for answers.
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Old 10-10-12, 08:04 AM   #542
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I love this answer! thank you for doing the math for me...the RX was a gift, yes, a gift. A wonderful gift.
Whether it was a gift or not you still have to consider the cost of ownership (insurance, maintenance, repairs, etc). While I'd love a $300K supercar as a gift I'd probably have to turn it down considering that the costs I mentioned would be impossible for me to handle.
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Old 10-11-12, 11:05 AM   #543
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With 25 k budget back in March, I told my wife she could either get a new vehicle like a RAV4 or a used 09 RX350. We couldn't even afford a new Highlander with my budget. She was concerned about the premium gas penalty on RX 350 until I explained the math to her, similar to what GatorMike had done. With her commute the difference would be $300 instead of $225. I figure I could save $300 elsewhere.
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Old 10-20-12, 04:57 PM   #544
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With 25 k budget back in March, I told my wife she could either get a new vehicle like a RAV4 or a used 09 RX350. We couldn't even afford a new Highlander with my budget. She was concerned about the premium gas penalty on RX 350 until I explained the math to her, similar to what GatorMike had done. With her commute the difference would be $300 instead of $225. I figure I could save $300 elsewhere.
5 years later RAV4 is just a Toyota but RX is still a Lexus!
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Old 10-21-12, 12:56 PM   #545
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5 years later RAV4 is just a Toyota but RX is still a Lexus!
Yeah. To me, $25k is a good budget for a used car in today's market. We picked up an 09 RX 350 with 20k miles 7 months ago. When we made the purchase she wasn't too happy about it. However, she really enjoys driving the vehicle now and doesn't regret the decision that I made for her anymore.
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Old 12-25-12, 02:59 PM   #546
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I own a 06 and an 08 and use 87 octane with no problems. With the 09 , 10 have they changed anything in the engine or is it the same engine requiring a higher octane

any help
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Old 12-25-12, 04:12 PM   #547
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Originally Posted by relax221 View Post
I own a 06 and an 08 and use 87 octane with no problems. With the 09 , 10 have they changed anything in the engine or is it the same engine requiring a higher octane

any help
The '09 is a 2nd Generation RX while the '10 is a 3rd Generation RX. So, while both are still RX350's they are not necessarily the same engine.

You can research the specs right from the Owner's Manuals here:

https://secure.drivers.lexus.com/lex...nual-search.do

The 2010 has this to say:

Name:  Screen shot 2012-12-25 at 7.06.10 PM.png
Views: 469
Size:  16.4 KB

There was a recent change made to the RX350 which now has it listed once again as needing only 87 octane at least starting with the 2012 model year. The RX450h still requires 91 octane.

Last edited by RX330inFL; 12-25-12 at 04:16 PM..
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Old 12-25-12, 04:21 PM   #548
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BTW, the '08 RX350 has always been stated as needing 91 octane or better. Of course, this is different than what you can get away with using. The 2nd Generation RX350 has reduced performance and MPG with the lower octane fuel.
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Old 12-27-12, 10:57 AM   #549
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Originally Posted by relax221 View Post
I own a 06 and an 08 and use 87 octane with no problems. With the 09 , 10 have they changed anything in the engine or is it the same engine requiring a higher octane

any help

May I ask what your fuel millage is using the 87 octane fuel?
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Last edited by lexus114; 12-28-12 at 08:22 AM..
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Old 12-27-12, 02:58 PM   #550
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I ran both regular gas and premium gas in the 2nd gen rx350 and can't say I feel any difference. With regular gas and moderate hwy speed (not cruise control) I was able to see 28mpg on short hwy segments. The overall tank avg was about 20-21mpg.
Same thing with the premium fuel...I would actually say the car drinks more premium fuel by 1-2mpg.
I only ended up using premium just because I am not 100% informed on long run consequences of using low grade fuel.
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Old 12-28-12, 07:49 PM   #551
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I only ended up using premium just because I am not 100% informed on long run consequences of using low grade fuel.
I don't know what you are considering "long run", but we are at 165K and have primarily used 85 octane (we live in Colorado where 85 = 87) since we purchased the vehicle new in November 2003.

I have a good friend that is a Toyota Master Diagnostic Tech and and we had a good chat. He is very confident that running 87 in the 3.3L V6 will not cause any long-term issues.

There have been posts where people are able to feel the difference between running 91 and 87 in the RX330, but a few years ago, I reset the ECU and tried a few tanks of premium and couldn't tell any difference. But, like I said, others have different experiences.

As with anything, YMMV.
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Old 12-30-12, 01:13 PM   #552
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I have never been able to measure any fuel consumption differences between regular and premium. There are some that swear by premium, but IMHO, it's a waste of money.
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Old 12-31-12, 07:07 AM   #553
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I only ended up using premium just because I am not 100% informed on long run consequences of using low grade fuel.
See
http://www.consumer.ftc.gov/articles...ctane-gasoline
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Old 07-15-13, 05:56 AM   #554
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Default Has anyone used ETHYNOL FREE GASOLINE in their RX350?

I have been using Premium Gas in my newly purchased 2008 RX 350 because that is what I assumed the manual was suggesting. HAS ANYONE tried using ETHYNOL FREE GASOLINE in their RX?
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Old 07-15-13, 07:44 AM   #555
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I have been using Premium Gas in my newly purchased 2008 RX 350 because that is what I assumed the manual was suggesting. HAS ANYONE tried using ETHYNOL FREE GASOLINE in their RX?
Yes, I usually burn real gasoline in my RX330. I can get ethanol free gasoline 5 miles from where I live. I do see 1-2 MPG improvement which stands to reason as that fuel has higher energy than ethanol blended gas. I also live just inside an area that requires vehicle emission testing and I get the same results no matter which fuel is in the vehicle. I always burn premium and the ethanol free gas is only available here in premium. Over the life of my RX330 (10 years) I have averaged 23.1 MPG measured. I do 80% highway/expressway driving and see 25-27 MPG there. I've not seen much difference in MPG in city driving with either fuel or any octane rating but on the expressway at a steady 60-75 mph I see a nice gain, especially with premium ethanol-free gas. Not sure what the 350 will do but I'm about to find out as I'm planning to get a 2014 RX.
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Old 07-15-13, 07:44 AM
 
 
 
 
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