What Octane Fuel are you using?

[solidbrix]

91 or higher.

FYI I had a chance to talk to 3 Toyota Engineers late last year at Overland Expo East. When I asked the question, they all looked at each other, rolled their eyes and said "OH, this question". They gave me a really long technical explantation but summed it up that because the Land Cruiser was designed in Japan, & designed to be a worldwide product, that premium fuel is the standard.

Anyone who's been abroad, will know this is true, our "premium" gas in the states for just regular in places like Europe.

Finally, when I expressed the "4Runner has same engine runs on different regular 87 octane level" debate, one engineer specifically said "If you're in the middle of nowhere and the only gas you can find is watered down crap, they designed the LC to make sure you get home, even on that".

I personally took the context as: Use Premium, only use regular or worse if you have too.

 

[RideWithYanu]

Finally, when I expressed the "4Runner has same engine runs on different regular 87 octane level" debate, one engineer specifically said "If you're in the middle of nowhere and the only gas you can find is watered down crap, they designed the LC to make sure you get home, even on that".

I just stick Premium personally, and hate this debate, but this part doesn’t actually make sense. That doesn’t answer why premium is suggested in the Land Cruisers but not the 4Runner with the same engine. Those Toyota engineers seem like turds.

 

[TakaraLC]

That's true, but it's just the simplistic way of describing that the engine control systems will adjust for octane variations.

It is a better explanation than the blanket claim you made about ECU preventing knock by adjusting timing.

Few ways that ECU can prevent pre-spark detonation are opening valves during compression to decrease pressure, or injecting fuel very late into compression cycle. Both of these methods will gradually damage the parts involved. Venting unburned fuel to exhaust will damage catalyst, and late injection of fuel will cause carbon buildup and injector baking.

 

[cvx5832LC]

My data so far on this long term experiment

Toyota Land Cruiser (Toyota Land Cruiser) | Fuelly

 

[BreezTrd]

I put premium 91-93

 

[NoMe cruiser]

Much talk about non ethanol fuel and it’s nice to have for seasonal equipment like snowmobiles, lawnmower etc… things that get stored for several months because the non ethanol won’t chemically separate like e10 does. I’ll say this about e10 though, I haven’t had a gas line freeze since the mandate.

 

[D-mac]

I just stick Premium personally, and hate this debate, but this part doesn’t actually make sense. That doesn’t answer why premium is suggested in the Land Cruisers but not the 4Runner with the same engine. Those Toyota engineers seem like turds.

4Runner and Tacoma are North America only vehicles, the Land Cruiser is not.

 

[ATbuckhunter]

I get premium, but thats just because I don't want to risk it. The engineers have clearly stated that it will run perfectly fine on 87 and not be damaged (maybe wont be as smooth or as quick). For me I planned on using regular, but decided to just stay with premium

 

[RideWithYanu]

4Runner and Tacoma are North America only vehicles, the Land Cruiser is not.

I’m not following the logic. If the engine requires a minimum octane; regional availability of the vehicles doesn’t explain why a minimum octane is required for the engine in one vehicle but not for another with the same engine.

It’s a non-answer as far as I can tell. But oh well, I’m going to continue on using premium regardless.

 

[D-mac]

I’m not following the logic. If the engine requires a minimum octane; regional availability of the vehicles doesn’t explain why a minimum octane is required for the engine in one vehicle but not for another with the same engine.

Toyotas and Lexus are built around the world with variants of the same engine. The same Toyota engine is capable of being tuned differently by the engine computer for different fuels by Toyota engineers (or could have additional measures for biofuels in some markets).
Toyota or any other manufacturer is not going to publicly release the fuel tuning/programming data for every Toyota and Lexus model and engine around the world, because that's their proprietary engineering info. Therefore, Toyota will make different fuel specifications for the same engine in different Toyota and Lexus models as they see fit.

 

[RideWithYanu]

Toyotas and Lexus are built around the world with variants of the same engine. The same Toyota engine is capable of being tuned differently by the engine computer for different fuels by Toyota engineers (or could have additional measures for biofuels in some markets).
Toyota or any other manufacturer is not going to publicly release the fuel tuning/programming data for every Toyota and Lexus model and engine around the world, because that's their proprietary engineering info. Therefore, Toyota will make different fuel specifications for the same engine in different Toyota and Lexus models as they see fit.

If tuning variations was the answer the “engineers” provided then that would have made a lot more sense. I think it’s a safe guess for the reason.

 

[D-mac]

If tuning variations was the answer the “engineers” provided then that would have made a lot more sense. I think it’s a safe guess for the reason.

Yes, there can be other differences to how the same engines are configured for a platform besides tuning, but as we have seen, Toyota isn't going to explain it in meaningful detail. If some members of the public want to believe a T24A-FTS engine in a Tacoma is configured and performs exactly the same as a T24A-FTS engine in a Land Cruiser or 4Runner, Toyota doesn't really care, other than to list different fuel specs and in some cases hp/torque numbers (which don't have to be 100% accurate) .

 

[RideWithYanu]

Yes, there can be other differences to how the same engines are configured for a platform besides tuning, but as we have seen, Toyota isn't going to explain it in meaningful detail. If some members of the public want to believe a T24A-FTS engine in a Tacoma is configured and performs exactly the same as a T24A-FTS engine in a Land Cruiser or 4Runner, Toyota doesn't really care, other than to list different fuel specs and in some cases hp/torque numbers (which don't have to be 100% accurate) .

I’m not clear what point you’re making exactly but will just go back to my original point that the explanation described in the original anecdote that I replied to above doesn’t make any sense.

 

[ultane]

91 or higher.

….. but summed it up that because the Land Cruiser was designed in Japan, & designed to be a worldwide product, that premium fuel is the standard.

Anyone who's been abroad, will know this is true, our "premium" gas in the states for just regular in places like Europe.

Finally, when I expressed the "4Runner has same engine runs on different regular 87 octane level" debate, one engineer specifically said "If you're in the middle of nowhere and the only gas you can find is watered down crap, they designed the LC to make sure you get home, even on that".

No worries for me.

The first paragraph doesn’t even ‘connect the dots’ of what they said, what came out of their mouth.. just a bunch of jibberish jaborwalky…

octane numbers are calculated differently in the states than elsewhere.

 

[ultane]

I just stick Premium personally, and hate this debate, but this part doesn’t actually make sense. That doesn’t answer why premium is suggested in the Land Cruisers but not the 4Runner with the same engine. Those Toyota engineers seem like turds.

X

 

[ultane]

My data so far on this long term experiment

Toyota Land Cruiser (Toyota Land Cruiser) | Fuelly

View attachment 40731

I am not smart enough to interpret that.