Premium Fuel or not?

[Nuke]

It is one page 641.

Thanks! Sort of conflicting information I think, compared to the previous page. Sure wish Toyota engineering would render an official statement. As previously stated, sure would be nice to see if the HP/Torque curves are identical between the Tacoma and LC.

 

[EOD Guy]

What I just read from your post attachments was "Optimal", "May Cause" "Worst Case" ......... didn't see the word "Will"...... so there's that.

 

[pdizzle]

I can hear what sounds like valves tapping if I run regular. Haven’t tried mid grade yet.

 

[Nuke]

I can hear what sounds like valves tapping if I run regular. Haven’t tried mid grade yet.

And, not when you use premium? Very interesting, and valuable info. Presumably you are at a very low altitude? However, and don't have a clear reading, being a turbo engine, is altitude much of a factor? In our neck of the woods, at 4800', "regular" is 85 octane.

 

[pdizzle]

And, not when you use premium? Very interesting, and valuable info. Presumably you are at a very low altitude? However, and don't have a clear reading, being a turbo engine, is altitude much of a factor? In our neck of the woods, at 4800', "regular" is 85 octane.

Yes this was all in Texas. I was taking a trip, used regular for two tanks (small ass gas tank) and it started making noise the next morning. Refilled with premium once tank was down to 1/4.
Took a few hours but noise went away and never came back. The first tank was chevron regular and second some random gas station.

 

[TakaraLC]

Yes this was all in Texas. I was taking a trip, used regular for two tanks (small ass gas tank) and it started making noise the next morning. Refilled with premium once tank was down to 1/4.
Took a few hours but noise went away and never came back. The first tank was chevron regular and second some random gas station.

Interesting, I thought ECU would be able to keep knocking under control in summer even with regular. What concerns me more is the colder/denser air during winter, especially after starting. Air can be as much as 20% denser here in Wisconsin compared to summer.

If it has minor knocking now, it will definitely knock in winter with regular.

 

[Nuke]

Yes this was all in Texas. I was taking a trip, used regular for two tanks (small ass gas tank) and it started making noise the next morning. Refilled with premium once tank was down to 1/4.
Took a few hours but noise went away and never came back. The first tank was chevron regular and second some random gas station.

What concerns me is that it took a few hours for the noise to go away. It should have been nearly immediately.

 

[tnb1]

Concerning required Premium Fuel, suggest you watch this video to the end if you haven’t already.

 

[memomate]

What I just read from your post attachments was "Optimal", "May Cause" "Worst Case" ......... didn't see the word "Will"...... so there's that.

“And will void the vehicle warranty”

 

[Hiker42]

Now, what is the "level previously stated?"
There's this: "if you use gasohol in your vehicle, be sure that it has an octane rating no lower than 91" but that's the only direct reference to an octane minimum that I see.

The manual is less than clear.

 

[memomate]

Now, what is the "level previously stated?"
There's this: "if you use gasohol in your vehicle, be sure that it has an octane rating no lower than 91" but that's the only direct reference to an octane minimum that I see.

The manual is less than clear.

Pg 634

 

[Hiker42]

I've made a request for clarification directly to Toyota via their website. I'll let you know if I get any information from them.

 

[TakaraLC]

Now, what is the "level previously stated?"
There's this: "if you use gasohol in your vehicle, be sure that it has an octane rating no lower than 91" but that's the only direct reference to an octane minimum that I see.

The manual is less than clear.

It it literally on the previous page lol.

 

[TakaraLC]

I've made a request for clarification directly to Toyota via their website. I'll let you know if I get any information from them.

Clarification for something they clearly stated 3 times in the manual?

Page 634

Page 640

Page 641

 

[ultane]

How do you let the turbo ‘cool’ down on a hybrid? Miss Daisy has to climb ~500 ft up in elevation on the driveway, which requires a little right foot. Do I just let her idle once in the carport, until the ICE shuts off??? (Sorry, I haven’t read the manual yet). It is easy to let the twin turbos on my Transit 350 cool down.. but on a hybrid? Does the ECU monitor that stuff?

 

[Nick]

I've made a request for clarification directly to Toyota via their website. I'll let you know if I get any information from them.

I was going to ask if any anyone has checked the land cruiser or 4runner blogs to see if there is any Toyota engineers on those sites.
We had a few on the Ranger forums and they really helped with questions like this. For now I'm gonna stay with that premium because of that video up above.
Will be waiting for Toyota's response to you. Please post an image of their response regardless of what it is. Thanks for the request you made.

 

[TakaraLC]

How do you let the turbo ‘cool’ down on a hybrid? Miss Daisy has to climb ~500 ft up in elevation on the driveway, whisch requires a little right foot. Do I just let her idle once in the carport, until the ICE shuts off??? (Sorry, I haven’t read the manual yet) it is easy to let the twin turbos on my Transit 350 cool down.. but on a hybrid? Does the ECU monitor that stuff?

Yeah you idle it for 1 min or so.

 

[LcAz]

Just adding info to the fuel conversation. At about 7 minutes in, this engineer talks about how Toyota aims to maintain reliability with smaller displacement engines (hint: combustion efficiency in decreasing heat is a part). Really interesting interview with lead engineer on the GX engine. My understanding is a similar principle is used on the LC 4 banger.

 

[ultane]

Yeah you idle it for 1 min or so.

View attachment 10074

Thank you very much!!

 

[Hiker42]

Clarification for something they clearly stated 3 times in the manual?

Page 634
View attachment 10068

Page 640
View attachment 10069
Page 641
View attachment 10070

I can see how you'd interpret it this way. But if you pay attention to this bit: "At minimum, the gasoline you use should meet the specifications of ASTM D4814 in the U.S.A..", one could reasonably conclude that there is no minimum octane requirement as that standard has no octane rating associated with it yet is clearly identified as a minimum standard. You've also demonstrated Toyota elected to print "Unleaded Gasoline Only", twice, when they could have written "Premium Unleaded Gasoline only."

The manual for German sedan I once had never introduced ambiguity like this. Maybe it's a Japanese to English translation issue?

You may be right, it may be the case that premium gas is required to avoid engine damage, but it's not laughable to question that given the info we have so far. Hopefully Toyota will give a clear answer.