Why does 2007 LX470 ‘require’ premium gas but 2005-2006 LX470 require regular gas? (1 Viewer)

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( from What octane do you run? )
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Good luck finding any factual information, about the variance in octane recommendations by Toyota/Lexus, for the 100 series.
 
Those are the Toyota landcruiser version not the Lexus LX470. The same debate exists on the lx570 and landcruiser where the landcruiser uses regular but the lx570 lexus recommends premium. Lexus had mentioned that the engine tuning or software on the Lexus lx570 is different than the landcruiser 200 so knock could happen even if thin engine and transmission are the same.

But yeah the LX470 2005 to 2006 are regular gas and the 2007 is premium per lexus.
 
I don't think the engine changed. They got caught overstating horsepower in 2006, so this may have had something to do with mitigating the impact of the correction in 2007.
 
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  1. People associate Lexus as a Premium brand. Porsches say Premium, BMW say Premium so... Lexus says Premium.
  2. There are literally millions of Toyota 4.7s running around the face of the earth. I doubt you can get 93 Octane Premium 200 miles in the middle of nowhere in Sudan.
  3. There are some situations where premium gas will make the motor more resistant to pinging. People that buy Lexus' don't like pinging. They prefer tomb-like quiet. So the manual says "put in the stuff that will never ping, under any circumstance". Easy solution to people complaining about pinging and unnecessary dealer visits only to educate them on gasoline octane.
  4. The ECU will adjust for almost any swill that you put in it, with timing. So to squeeze those last few advertised HP out of the motor, premium is the choice. But in the real world, your butt-dyno won't notice.

So, to summarize - there is a substantial savings to be had putting 87 octane (or whatever your local low octane is) in the tank of a vehicle that get 13-15MPG. Put in the cheap stuff (from a brand name dealership), and forget about it.
 
Those are the Toyota landcruiser version not the Lexus LX470. The same debate exists on the lx570 and landcruiser where the landcruiser uses regular but the lx570 lexus recommends premium. Lexus had mentioned that the engine tuning or software on the Lexus lx570 is different than the landcruiser 200 so knock could happen even if thin engine and transmission are the same.

But yeah the LX470 2005 to 2006 are regular gas and the 2007 is premium per lexus.

If you look at the chart above, the Toyota vs. Lexus anecdote doesn't seem to line up with the chart (except for one year, 2007)
 
Here is my guess and this is probably all your going to get is a guess from anyone. It most likely has to do with advertising and fleet fuel average. Car manufacturers are hit with taxes or fines, whatever you want to call them, on fleet MPG average. By stating premium it ups the MPG. Usually not a bit deal in a model that sells as few as the LX but i'm betting that lexus just went to premium across the board on all there cars.
 
Those are the Toyota landcruiser version not the Lexus LX470. The same debate exists on the lx570 and landcruiser where the landcruiser uses regular but the lx570 lexus recommends premium. Lexus had mentioned that the engine tuning or software on the Lexus lx570 is different than the landcruiser 200 so knock could happen even if thin engine and transmission are the same.

But yeah the LX470 2005 to 2006 are regular gas and the 2007 is premium per lexus.
The 08-11 LX570 and LC200 use the exact same Engine Control Unit/Module. Where is this difference in tuning occurring? I wouldn't get so hung up on the '06 vs '07 literature/advertising. Nothing mechanical changed substantially.
 
I’ve read through previous threads on the premium vs regular gas debate, and the general sentiment was that if Lexus stated to use premium that it would be better to use it, but using regular is likely fine. I agree that using regular is probably ok, but still curious why the 2007 states “premium fuel” but the 2005-2006 don’t. Was there some change between 2006-2007 say in how the engine is tuned?
Yeah... Standard internet forum stuff. The manufacturer said do it, so you better. Then 5 pages of arguments ensue.

Pretty sure Lexus doesn't recommend the tires, wheels bumpers, etc half of us run. :)

Do you think you'll have knock? Do you think there will be other adverse effects? I doubt it.
 
I ran 87 for nearly 2 years. But, I was adding Seafoam Fuel Treatment to every other tank. I started running 91 back in November without adding Seafoam. The overall cost is about the same. I haven't seen any performance increase. But, as I understand it, premium fuel isn't as "dirty" and is better at keeping the motor clean. Definitely hurts less now that gas has been around 2.29/gallon for premium. My tone might change if we get back into the $3-4 range again.

One thing I have noticed though is that when I've been able to run "pure" gas (Silverton, CO has a station that offers it), my rig runs noticeably better and for a longer distance. Why oh why do we have to have these damnable ethanol blends!????
 

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