Bought 1999 RX - Previous Owner Used 87 - I use 91 - MPG Plummet! - Page 2 - ClubLexus - Lexus Forum Discussion


RX - 1st Gen (1999-2003) Discussion topics related to the 1999 -2003 RX300 models

Bought 1999 RX - Previous Owner Used 87 - I use 91 - MPG Plummet!

Reply
 
 
 
Thread Tools Search this Thread
Old 06-15-12, 02:22 PM   #16
hypervish
Lexus Fanatic
 
hypervish's Avatar
 
Join Date: Aug 2009
Location: NJ
Posts: 5,576
Thanked 25 Times in 23 Posts
Default

He's not... The RX300 has knock sensors for a reason, they alert the ECU when the engine knocks, and then the ECU makes the necessary adjustments.

The RX300 engine, 1MZ-FE, has a 10.5:1 compression ratio. That is high compression, and due to that 91 octane or higher is needed.

Last edited by salimshah; 06-15-12 at 03:08 PM.
hypervish is offline   Reply With Quote
Old 06-15-12, 02:37 PM   #17
iolmaster
Lead Lap
iTrader: (1)
 
Join Date: Aug 2008
Location: Virginia
Posts: 793
Thanks: 0
Thanked 17 Times in 16 Posts
Default

OK enough is enough. I will continue to use regular and get great gas mileage. I guess I will just have to take the chance that I destroy my engine.
iolmaster is offline   Reply With Quote
Old 06-15-12, 03:12 PM   #18
salimshah
Moderator
 
Join Date: Apr 2001
Location: Austin, TX
Posts: 11,208
Thanked 150 Times in 145 Posts
Default

Ok guys!

I have made some edits to this thread.

Please feel free to disagree and above all be respectful. And in any argument, there comes a point when the other person is not going to agree. At that point please agree to disagree and move on.



Salim
salimshah is offline   Reply With Quote
Old 06-16-12, 09:38 AM   #19
RXdriver11
Rookie
 
Join Date: Nov 2011
Location: California
Posts: 84
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Agree with Salim..
Also just do what I did.. Try a few tanks full of one take notes, and then try the other and compare your results in your car that you drive under your driving conditions.
RXdriver11 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
15 MPG on 2008 AWD IS250? henryle502 IS - 2nd Gen (2006-2013) 8 03-23-17 10:56 AM
New fuel pump = lower MPG's.... tcarlson23 HS 250h Model (2010-2012) 3 12-16-16 08:26 PM
2017 MPG change rusn007 GX - 2nd Gen (2010-present) 11 11-04-16 08:37 AM
My LS460 MPG Experiment daryll40 LS - 4th Gen (2007-2017) 78 06-22-16 12:34 PM


Tags
1999 , 450h , 87 , 89 , 91 , benz , c300 , lexus , mercedes , mpg , mph , normal , ran , rx , temperature

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -7. The time now is 12:46 AM.


Copyright © 2000-2017 Internet Brands, Inc. All Rights Reserved We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: