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

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RX - 2nd Gen (2004-2009) Discussion topics related to the 2004 -2009 RX330, RX350 and RX400H models
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Do you need Premium Gas in the 2RX (merged discussion threads)

 
Old 03-20-17, 08:58 AM
  #631  
DennisMik
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I can't remember the last time I had a car where I was forced to run premium in it. I use the cheapest gas I can find. The computer adjusts the timing so the engine doesn't ping. Every once in a while I will fill up with premium and I can detect a difference in performance. But it is not that great so I don't make a habit of it.
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Old 05-05-19, 05:06 PM
  #632  
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Default Premium fuel for your rx330

My 06 rx330 requires to use premium fuel. How many of you use premium gas? What if not...
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Old 05-09-19, 12:54 PM
  #633  
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Older model are recommended to use premium gas while newer model could use regular gas. However the price is 12% difference. I am wondering if I could use regular instead of premium gas.
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Old 05-09-19, 02:09 PM
  #634  
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My 05 RX330 recommends regular unleaded. Read your manual. If it requires premium then use it. Or, if it requires regular, and you like to give extra money to the oil companies, buy it. Seriously I have never noticed any MPG or power improvement with Premium.
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Old 05-09-19, 04:37 PM
  #635  
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2004 RX330 - 242,000 miles all on 85 octane (mountains - same as 87 at other elevations). I have run a couple of tanks of premium and never noticed any difference in mpg, hp, etc.

Last edited by cdnewton; 05-09-19 at 07:03 PM. Reason: wording
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Old 05-09-19, 07:01 PM
  #636  
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From the 2007 RX Owners Manual, Section 6-1 Specifications, page 399, titled "Fuel information":

Your vehicle must use only unleaded gasoline. Premium unleaded gasoline with an octane rating of 91 (Research Octane Number 96) or higher required for optimum engine performance. At minimum, the gasoline you use should meet the specifications of ASTM D4814 in the U.S.A. and CGSB3.5-M93 in Canada.

* Fuel tank opening for unleaded gasoline - To help prevent incorrect fueling, your Lexus has a fuel tank opening that only accommodates the special nozzle on unleaded fuel pumps.

* If premium gasoline is not available - If 91 rating gasoline cannot be obtained, you may use unleaded gasoline with an octane rating as low as 87 (Research Octane Number 91).

* If your engine knocks
Consult your Lexus dealer.
You may occasionally notice light knocking for a short time while accelerating or driving uphill. This is normal and there is no need for concern.

* Gasoline quality - In very few cases, driveability problems may be caused by the brand of gasoline you are using. If driveability problems persist, try changing the brand of gasoline. If this does not correct the problem, consult your Lexus dealer.
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Old 05-10-19, 05:07 PM
  #637  
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2006 RX330 AWD 238,000km on 87 regular all the time since brought used at 100,000km , Never got engine issues and still has good MPG with factory A/F R and O2.

Engine runs smooth and quiet with dino oil 8,000km change interval always. all spark plus are good shape when changed out at 180,000km.
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Old 05-10-19, 05:53 PM
  #638  
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I mostly run premium in my 07 rx350. But I have on a few occasions run regular but then noticed I wasnt getting the average of 22-24ish mpg that I had been getting using premium
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Old 05-10-19, 10:27 PM
  #639  
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you get more miles per tank (and better performance) with premium fuel. If you work out cost per mileage the difference is very small $. premium fuel = higher $ to fill up the tank, but greater distance, with better performance.
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Old 05-11-19, 08:19 AM
  #640  
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My comments refer to the "second generation" RX with the 3.3L V6, I believe the 3.5L V6 is also categorized in the second generation and may be different.

2004 RX330 owners manual on octane rating:
Select Octane Rating 87 (Research Octane Number 91) or higher. For improved vehicle performance, the use of premium unleaded gasoline with an Octane Rating of 91 (Research Octane Number 96) or higher is recommended.

There is a big difference between 'required' and 'recommended'.

Finally, the 3.3L V6 is the same engine used in the Highlander (both with compression ratio 10.8:1) and it requires 87 octane.

Last edited by cdnewton; 05-11-19 at 09:19 AM.
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Old 05-11-19, 09:13 AM
  #641  
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Premium gas gives you more miles per gallon than regular gas.

Sorry, that's pretty much booo-gus.

Here's why.

Each gallon of gas that we pump from our local Quickie Mart is actually made up from as many as seven different ingredients. The exact amount of energy in each gallon of premium or regular gas will vary from company to company, depending upon what kind of additives they use.

In actual fact, you'll get a greater range of fuel economy between different brands of regular gas, than you will between the same manufacturer's regular and premium gasses. Interesting, eh? We thought so.

Finally, here's a nice irony: to increase gas' octane rating, companies add ethanol, when they're mixing up a batch of premium fuel. Interestingly, ethanol actually contains less energy than untreated gas, so the net result from the ethanol component is a reduction in your MPG. Other premium additives, however, have the reverse effect, and slightly increase your MPG. So okay, overall premium provides a very slight net increase in MPG, but it's so slight that we swear you won't notice the difference.

I always used the increased MPG that resulted from using premium as a justification to purchase it.

Too bad. Consider yourself better informed now, and stop lining the pockets of oil companies, okay?

https://www.cartalk.com/content/prem...egular-0#myth1
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Old 05-11-19, 07:12 PM
  #642  
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Both my RX and my wifeís Infiniti call for premium so thatís what I use. It helps that neither is driven a lot of miles. (6000 and 3000 a year) Usually get 30-50 cents a gallon off using gas card, so fill them both up once a month.
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Old 05-23-19, 10:11 AM
  #643  
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I've never run anything in my RXs (300 and 350) - for more than a decade - but 87 and have never heard any knock/ping. I had O2 sensor issues with my 300 but my mechanic never asked me about the gas octane level I used.

Why spend money on 91 octane if you don't need to?

There are a lot of items in the manual that the manufacturer (especially the legal department) includes to protect their backside. I'm sure every ClubLexus forum user puts on their parking brake every time they turn off their car...

The best advice I learned a long time ago was never fill your tank up while a tanker truck is servicing the station. Since the fuel going in the station's tanks is churning up sediment/crap on the bottom of the station's tanks that have been there for many years - decades in some cases, just drive to the next station or come back the next day.
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Old 06-10-19, 02:40 PM
  #644  
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FYI
Premium from Costco is often cheaper than Mid grade at other stations...
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