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

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Old 10-11-12, 11:05 AM   #541
gt1209
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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   #542
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Originally Posted by gt1209 View Post
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   #543
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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   #544
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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   #545
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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
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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   #546
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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   #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

May I ask what your fuel millage is using the 87 octane fuel?
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Old 12-27-12, 02:58 PM   #548
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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   #549
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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   #550
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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   #551
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Originally Posted by dragosdor View Post
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   #552
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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   #553
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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 04-16-14, 05:42 AM   #554
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Default 2007 RX350 Gas Mileage

I have about 72k miles on my RX.

I get about 18 or 19 mixes city/hwy

I started putting in Premium fuel. 92 I think, and the performance and pickup has improved. Not sure about the mpg quite yet.
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Old 04-19-14, 12:13 PM   #555
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If you check the Toyota Technical Information System site (emissions) there is a discussion in the training session on the effect of gasoline grades with Toyota engines with knock sensors (typically all modern engines with emission controls). These engines will adjust to fuel grades and prevent knocking. When the engine detonates, the ECM will adjust and retard the spark, which will negatively affect engine performance and fuel economy under all driving conditions. For engines with advanced ECM (essentially all modern engines), an adaptive memory factor is used to track the signals from the knock sensor. This means the retarded setting will be maintained for an extended period of time, even though a tank of higher grade fuel is used. This "keep alive" memory can be cleared by removing power from the BATT terminal. Unless the memory is cleared, the engine will be operating at a retarded spark condition even while alternating 87 and 93 fuel; so little benefit of the one tank of 93 fuel will be realized. Toyota has used several different EFI ignition systems, and rather than a linear effect of fuel use, these systems now take multiple inputs (fuel, coolant, engine load, etc.) to create a 3D spark map.

What I did to test 87 vs 93 was to do so during a road trip with a loaded vehicle (2004 3.3L 5 spd auto) and use cruise control across rolling hills in OK and KS. The engine never pinged on 87, but it noticeably downshifted more on hills to maintain speed than when I tested it with 93 fuel. Interestingly, the downshifts on 87 seemed more abrupt, whereas the relatively few downshifts on 93 were smooth downshifts. Mileage difference was negligible, about 0.5 MPG better for 93 fuel. I did the same with the LX470, with similar results.

My conclusions from this information was that Toyota had good control of the engine regardless of the octane rating chosen, but there were torque, HP, and economy impacts for using 87 instead of premium. Even a Toyota vehicle rated for 87 will perform better on 91 as the ECM adjusts. This is most noticeable on trips with a loaded car than around town with an empty car. Premium fuel will give smoother torque response, which with a big, heavy vehicle like the LX may be noticeable in city driving, but is clearly noted on trips with cruise control.
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Old 04-19-14, 12:13 PM
 
 
 
 
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