Premium for 2010-2011 RX350? (merged threads)
Driver School Candidate
Joined: Nov 2010
Posts: 29
Likes: 0
I read somewhere (sorry do not remember where) that premium gas will get you around 10% more MPG for a high end engine like in RX, i.e. tightly tuned and with high compression ratio. I have not done the experiment myself, but this was on my to-do list. Since the the price difference between regular and premium is about 8%, I am sticking with premium for now and waiting for someone who is more scientific to do the experiment...
Frankly, I am more worried about 10% ethanol in ALL grades of gas sold in NJ than choosing regular or premium. Ethanol does not help the environment but does hurt mpg - this is pure political, both planet earth and we (tax payers) end up being the victims here.
Frankly, I am more worried about 10% ethanol in ALL grades of gas sold in NJ than choosing regular or premium. Ethanol does not help the environment but does hurt mpg - this is pure political, both planet earth and we (tax payers) end up being the victims here.
Lexus Test Driver
Joined: Feb 2010
Posts: 1,315
Likes: 0
From: MA
I did a experiment on my old GX years back, on 93 octance, I was getting about 15 MPG and then I run about 4 tanks of 87 octance and got 14.7 MPG. Not sure what that tells me, because its impossible to drive under the same condition with the two octance.
For those of you who take octance recommandation from your dealer, unless your saleman is an expert on modern internal combusion engines, I would take the recommandation form Lexus engineers instead of your salesman.
For those of you who take octance recommandation from your dealer, unless your saleman is an expert on modern internal combusion engines, I would take the recommandation form Lexus engineers instead of your salesman.
Driver School Candidate
Joined: May 2007
Posts: 26
Likes: 0
From: Texas
A suggestion: Ask your dealer what grade of gas is in the pump tanks at the dealership....
I know that when I asked mine that question, the answer was:::: Regular.
Not saying you won't get better mileage from using premium, though
Vern
I know that when I asked mine that question, the answer was:::: Regular.
Not saying you won't get better mileage from using premium, though
Vern
Lead Lap
Joined: Aug 2004
Posts: 542
Likes: 3
From: New Jersey
My service advisor said I need to use Premium on the new RX 350. Something different about this engine. (maybe they tweaked it???) He said I could get away with the regular on the old RXs. Since he has never misled him I would trust him. He drives RXs.
Lexus Test Driver
Joined: Dec 2009
Posts: 1,146
Likes: 7
From: AZ
I heard that for 2012 the RX will be rated for regular like they did the ES for 2011. I'm sure the HP will drop. I will continue to use Premium as the difference in $ is so minor in the long run. I have never used anything else ever in any car I have ever owned and never had a problem.
ClubLexus Stories
Celebrating Lexus & Toyota from Around the Globe
Top 10 Most Confusing Things Lexus Has Ever Done!
Joe Kucinski
2026 Lexus ES Review: Lexus Re-Embraces Founding Principles
Michael S. Palmer
10 Lexus Bargains That are Cheaper Than a New Toyota RAV4
Joe Kucinski
8 Weirdest Things Lexus Has Ever Built
Verdad Gallardo
10 Lexus Designs That Have Aged Like Fine Wine
Verdad Gallardo
8 Tips for Improving Your Hybrid or Plug-in Hybrid's Efficiency!
Michael S. Palmer
10 Best Lexus Models No One Remembers
Joe Kucinski
TRD Off-Road Premium: Best 2026 4Runner, Except This One Thing
Michael S. Palmer
Top 10 Lexus & Toyotas to Drive Before You Die!
Joe Kucinski
Lead Lap
Joined: May 2007
Posts: 513
Likes: 3
From: QLD, Australia
What is in the Handbook is what is required under the Warranty not what some idiot at the Stealership said.
Use at your own risk and don't complain if your engine gets damaged as a result.
Given the inconsequential difference in cost overall, this is another example of cheaping out. Time to put my fireproof undies on!
Use at your own risk and don't complain if your engine gets damaged as a result.
Given the inconsequential difference in cost overall, this is another example of cheaping out. Time to put my fireproof undies on!
Instructor
Joined: Nov 2004
Posts: 873
Likes: 1
From: Alabama
It does not say you HAVE to use 91 they would like you to but that is it. As far as the rest of this goes if you want to try a few tanks of 87, or 89 do so and see what it will do for your mpg. What you need in New Jersey or Texas might not be the same as
out west or on the gulf coast or sun coast.
out west or on the gulf coast or sun coast.
Lead Lap
Joined: May 2007
Posts: 513
Likes: 3
From: QLD, Australia
Unless of course you mean the entire cost of a Gallon that you will save over the life of the vehicle! :-)
Driver School Candidate
Joined: May 2010
Posts: 17
Likes: 0
From: MD
What about 89 vs 91 octane? I can either put 87,89 or 93 in around my area. Would I be OK using midgrade. So far I have been only using 93 @ 25K miles. Although it was a dealer demo for the first 9K I am sure they were using regular.
What are the thought on 89 octane?
What are the thought on 89 octane?
Lexus Test Driver
Joined: Feb 2010
Posts: 1,315
Likes: 0
From: MA
