epmccoy Posted May 1, 2006 Share Posted May 1, 2006 Does the GX require premium unleaded, or is regular unleaded fine? I don't see any mention of premium in the owners manual or in the fuel filler door.... Thanks Quote Link to comment Share on other sites More sharing options...
dcfish Posted May 1, 2006 Share Posted May 1, 2006 Does the GX require premium unleaded, or is regular unleaded fine? I don't see any mention of premium in the owners manual or in the fuel filler door.... Thanks Have you searched the gx forums ? http://us.lexusownersclub.com/forums/index...act=Search&f=28 Always loads of info there. ;) Quote Link to comment Share on other sites More sharing options...
PaulERGX470 Posted May 1, 2006 Share Posted May 1, 2006 Does the GX require premium unleaded, or is regular unleaded fine? I don't see any mention of premium in the owners manual or in the fuel filler door.... Thanks You don't say what MY you have. I have an 06 & the OM states premium, but regular can be used if premium is not available. When I was doing research prior to buying the vehicle, using the Lexus.com website, the vehicle comparison feature was powered by edmunds.com & it stated that the vehicle (GX) used regular unleaded. Btw, the sticker inside the fuel door of my 06 states Premium. Quote Link to comment Share on other sites More sharing options...
epmccoy Posted May 2, 2006 Author Share Posted May 2, 2006 I also reviewed the Edmunds info and found the same thing. My GX is a 2005 and does not have a sticker inside the fuel filler door......owners manual dances around the subject, but does not explicitly state one or the other. Quote Link to comment Share on other sites More sharing options...
trebien Posted May 2, 2006 Share Posted May 2, 2006 I just took a 2000+ mile trip in my 2006 GX on mainly flat highways, and played around with fuel grades for kicks. The premium cost more, but got much better gas mileage so it outweighed the cost. Basically, in a modeern high-compression engine designed for higher octane fuel, the electronics will !Removed! the timing if you use lower octane, and you will need more gas to create the same amount of power as a higher octane gas would be capable of creating. Most times, using a lesser octane (cheaper) gas will not save you money in an engine designed to use a higher octane fuel in the first place. Plus, the higher octane fuels tend to have a better mix of detergents/additives to keep everything running smoothly. For instance, in one very long stretch of flat road, 91 octane "Premium" gas got me 18.5 MPG and 89 "Plus" got me 16.5 mpg... I went back and forth, and the results were the same. Didn't try the basic "low-grade" 87 octane. Quote Link to comment Share on other sites More sharing options...
strindl Posted May 2, 2006 Share Posted May 2, 2006 There is a difference here in the engines in differing model years. They upped the compression ratio for the 2005 model year, which would make the use of 91 octane more beneficial. I have a 2004 and have experimented with both 91 octane and 87 octane. For normal driving, I have noticed no difference at all...not in performence or mpg. Quote Link to comment Share on other sites More sharing options...
denslexusgx470 Posted May 2, 2006 Share Posted May 2, 2006 03s and 04s don't require premium. when the engine got upgraded to VVti then Premium was required (05s and newer). Quote Link to comment Share on other sites More sharing options...
Lexusfreak Posted May 3, 2006 Share Posted May 3, 2006 How big is the tank? Just wondering. B) Quote Link to comment Share on other sites More sharing options...
The G Man Posted May 4, 2006 Share Posted May 4, 2006 03s and 04s don't require premium. when the engine got upgraded to VVti then Premium was required (05s and newer). The 05 doesn't require premium either. The manual states, minimum octane 87, for better performance, use 91. I dont understand, the 05 and the 06 have the same engine, the 06 requires premium and the 05 does not. The 06 4runner V8 has the same engine, but it does not require premium either. I just try out the 1st tank of 87 yesterday, so far so good, didnt notice much difference. Quote Link to comment Share on other sites More sharing options...
n8vlex Posted June 24, 2007 Share Posted June 24, 2007 03s and 04s don't require premium. when the engine got upgraded to VVti then Premium was required (05s and newer). The 05 doesn't require premium either. The manual states, minimum octane 87, for better performance, use 91. I dont understand, the 05 and the 06 have the same engine, the 06 requires premium and the 05 does not. The 06 4runner V8 has the same engine, but it does not require premium either. I just try out the 1st tank of 87 yesterday, so far so good, didnt notice much difference. We got an 07GX a few weeks ago. The first couple of fill ups were with 91 octane California gas. Since the car is basically a people mover, performance is not as high a concern. I'm planning on switching to 87octane full time. Any problems at all with 87octane? Quote Link to comment Share on other sites More sharing options...
strindl Posted June 26, 2007 Share Posted June 26, 2007 We got an 07GX a few weeks ago. The first couple of fill ups were with 91 octane California gas. Since the car is basically a people mover, performance is not as high a concern. I'm planning on switching to 87octane full time. Any problems at all with 87octane? I have a 2004, and I use only 87 octane now. I have never had a problem using it. I notice no difference at all in performance or mpg when switching to 91 octane. Quote Link to comment Share on other sites More sharing options...
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