Fuel Type for RX 400h
#31
Also, you should only get "Top Tier" gas for your car, which has extra cleaning agents. I always look for this when I fill up and there's clear evidence that it helps keep your engine cleaner. Costco has it and so does Shell and quite a few others.
https://www.consumerreports.org/car-...h-extra-price/
https://en.wikipedia.org/wiki/Top_Ti...rgent_Gasoline
https://www.consumerreports.org/car-...h-extra-price/
https://en.wikipedia.org/wiki/Top_Ti...rgent_Gasoline
#32
"Top Tier" gas for your car
Also, you should only get "Top Tier" gas for your car, which has extra cleaning agents. I always look for this when I fill up and there's clear evidence that it helps keep your engine cleaner. Costco has it and so does Shell and quite a few others.
https://www.consumerreports.org/car-...h-extra-price/
https://en.wikipedia.org/wiki/Top_Ti...rgent_Gasoline
https://www.consumerreports.org/car-...h-extra-price/
https://en.wikipedia.org/wiki/Top_Ti...rgent_Gasoline
#33
That's not a very credible source of info on gas.
Premium has special or extra detergents in it that are worth the added cost.
I will void my warranty if my owner's manual calls for premium and I use regular unleaded.
Using regular gas in a car designed for premium will definitely damage the engine.
#34
It does not matter what that website says because it has no credibility. That means that the info it provides are highly susceptible to being inaccurate.
If Toyota says to use premium fuel only, then wouldn't it be wise to listen to them since they made the dang cars? Also, it doesn't matter if one gets better mileage or no knocking as these things may or may not be associated with the different grades of fuel. No one here is an engineer.
#35
It does not matter what that website says because it has no credibility. That means that the info it provides are highly susceptible to being inaccurate.
If Toyota says to use premium fuel only, then wouldn't it be wise to listen to them since they made the dang cars? Also, it doesn't matter if one gets better mileage or no knocking as these things may or may not be associated with the different grades of fuel. No one here is an engineer.
If Toyota says to use premium fuel only, then wouldn't it be wise to listen to them since they made the dang cars? Also, it doesn't matter if one gets better mileage or no knocking as these things may or may not be associated with the different grades of fuel. No one here is an engineer.
#37
Driver School Candidate
Since my last comment on this thread, I've used 87 octane without ethanol on two tanks, and my average mileage is still higher than before. The higher octane gas I was using before also has no blended ethanol, so apparently it's the ethanol that pulls my mileage down.
#38
Yours must be special, because mine says nothing about octane. And like I mentioned earlier, the manual specifically says "87 or higher."
Since my last comment on this thread, I've used 87 octane without ethanol on two tanks, and my average mileage is still higher than before. The higher octane gas I was using before also has no blended ethanol, so apparently it's the ethanol that pulls my mileage down.
Since my last comment on this thread, I've used 87 octane without ethanol on two tanks, and my average mileage is still higher than before. The higher octane gas I was using before also has no blended ethanol, so apparently it's the ethanol that pulls my mileage down.
#39
So far I've had no issues using 87 octane in our 2007. The compression ratio is lower in the hybrid motor compared to the non-hybrid Toyota V6s. I see no difference in fuel economy and the sister Toyota Highlander Hybrid does not say "premium fuel only." The skeptic in me thinks Toyota/Lexus did this for a prestige factor in the brand. 180K miles and no complaints so far.
#41
To add to the confusion, my 08 RX400h recommends 91 Octane. i just had an engine swap with a 07 HiHy and the manual just say 87. I have used mainly Costco premium (top teir) for mine and was surprise to see the build up in the piston and valves. Granted I did not know what the previous owner used.
From 400h manual.
"Fuel selection: Select Octane Rating 87 (Research Octane Number 91) or higher. For improved vehicle performance, the use of premium unleaded gasoline with an Octane Rating 91 (Research Octane Number 96) or higher is recommended."
The engine is a 3MZFE with a 10.8:1 compression ratio. (it is listed by Toyota that it is a reduced output for rx400h and HiHy) I am not sure what the difference is in the newer hybrids the change is that they actually change the compression ratio and turn it into a Atkinson cycle engine-the RX450)
Also interesting read about this engine on 87/91 when it is used on non-hybrids https://www.v6performance.net/forums...um-3mz-fe.html
From 400h manual.
"Fuel selection: Select Octane Rating 87 (Research Octane Number 91) or higher. For improved vehicle performance, the use of premium unleaded gasoline with an Octane Rating 91 (Research Octane Number 96) or higher is recommended."
The engine is a 3MZFE with a 10.8:1 compression ratio. (it is listed by Toyota that it is a reduced output for rx400h and HiHy) I am not sure what the difference is in the newer hybrids the change is that they actually change the compression ratio and turn it into a Atkinson cycle engine-the RX450)
Also interesting read about this engine on 87/91 when it is used on non-hybrids https://www.v6performance.net/forums...um-3mz-fe.html
#43
I recent took my car to a new mechanic, a nice old Japanese man who specializes in Toyota & Lexus, to get the a/c checked out. He says I should always get 91-octane name-brand gas and inflate my tires to 40 psi. (5 psi above forum members recommendation). I followed his advice two weeks ago and went from 18 to 24mpg in city stop-and-go traffic (80% of my driving) and 30 on open freeway. Just FYI.
#44
Lexus Champion
If you use regular will lose couple horses and up and go. If you're planning towing something chance for pinging
which is bad for the engine.
#45
Lexus Champion
It does not matter what that website says because it has no credibility. That means that the info it provides are highly susceptible to being inaccurate.
If Toyota says to use premium fuel only, then wouldn't it be wise to listen to them since they made the dang cars? Also, it doesn't matter if one gets better mileage or no knocking as these things may or may not be associated with the different grades of fuel. No one here is an engineer.
If Toyota says to use premium fuel only, then wouldn't it be wise to listen to them since they made the dang cars? Also, it doesn't matter if one gets better mileage or no knocking as these things may or may not be associated with the different grades of fuel. No one here is an engineer.