New to Lexus family and forum
03-12-12 | 02:10 PM
#1
Thread Starter
Driver School Candidate
Joined: Mar 2012
Posts: 3
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From: TX
New to Lexus family and forum
Hello everyone, I just picked up a new (to me) '09 IS250 last week.... I am stoked about this car and I am learning as much as I can about it from the forums....
Now that I've driven it all around town for a good few days and my tank is quickly approaching E my first question to y'all is...What octane do you use? I know Lexus suggests Premium, but is there any reason why I couldn't drop it down to a mid-grade level?
Now that I've driven it all around town for a good few days and my tank is quickly approaching E my first question to y'all is...What octane do you use? I know Lexus suggests Premium, but is there any reason why I couldn't drop it down to a mid-grade level?
03-12-12 | 03:13 PM
#3
Better not to drop down on the gas level... you bought a luxury car, so treat her nice 
The engine has been designed to run on Premium gas because of it's high compression. If you want to run lower octane to save cash, you are going NOWHERE. Mostly likely, you will end up with WORSE gas mileage running lower octane. So in the end, you might was well buy Premium.
I did the exact stuff you were thinking on my Nissan SE-R Spec V ... in the end, my gas milease dropped from 27 MPG to 20 MPG on FREEWAYS. Not worth it to be a cheap bastard.... if you can't afford the gas, then you might as well get a Honda.
BTW// Congrats on the car...
The engine has been designed to run on Premium gas because of it's high compression. If you want to run lower octane to save cash, you are going NOWHERE. Mostly likely, you will end up with WORSE gas mileage running lower octane. So in the end, you might was well buy Premium.
I did the exact stuff you were thinking on my Nissan SE-R Spec V ... in the end, my gas milease dropped from 27 MPG to 20 MPG on FREEWAYS. Not worth it to be a cheap bastard.... if you can't afford the gas, then you might as well get a Honda.
BTW// Congrats on the car...
03-12-12 | 03:25 PM
#6
Welcome and congrats on the new car, post up a pic too! 
As far as the octane goes, fill the premium. It's what the motor was engineered to run on And like shadowman said, this engine is high compression, so you really are better off sticking with premium then saving 10 cents a gallon to put mid-grade in instead. The car will be most efficient on Premium
As far as the octane goes, fill the premium. It's what the motor was engineered to run on
And like shadowman said, this engine is high compression, so you really are better off sticking with premium then saving 10 cents a gallon to put mid-grade in instead. The car will be most efficient on Premium
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03-12-12 | 05:29 PM
#12
Lexus Champion
Joined: Mar 2011
Posts: 2,058
Likes: 0
From: WA
Grats on the new purchase! If you haven't already, read through this thread: https://www.clublexus.com/forums/is-...ease-read.html
Tons of info there, including one on the type of gas to use. The car has a high compression engine so using lower than 91 octane will cause premature ignition (pings.) Not good.
And pics!
Tons of info there, including one on the type of gas to use. The car has a high compression engine so using lower than 91 octane will cause premature ignition (pings.) Not good.
And pics!
03-12-12 | 06:21 PM
#14
Welcome and congrats!
Be sure to check out the 2IS FAQ sticky at the top of this forum; it'll have answers to many of your questions including the one in your post above.
https://www.clublexus.com/forums/is-...d-threads.html
Be sure to check out the 2IS FAQ sticky at the top of this forum; it'll have answers to many of your questions including the one in your post above.
https://www.clublexus.com/forums/is-...d-threads.html
