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This subject has been beat to death, there are at least 2 dozen posts on this.I have seen mixed information. Is premium required or not? What is everybody running? Is there an advantage?
But, the Tacoma also employs a turbo with the apparently same engine parameters. Are there differences? Possibly in the computer software?Premium is required because of Toyota being conservative about the turbo.
There was an interview with one of the engineers where he said there was some difference in how the power trains were tuned so that the LC optimized on premium. Can’t remember where I saw it or the exact rationale.But, the Tacoma also employs a turbo with the apparently same engine parameters. Are there differences? Possibly in the computer software?
If they were tuned different wouldn't they then get different hp/torque numbers? Why tune it differently in the landcruiser to require 93 but gives no benefit to HP/Torque???There was an interview with one of the engineers where he said there was some difference in how the power trains were tuned so that the LC optimized on premium. Can’t remember where I saw it or the exact rationale.
They are different vehicles in size and weight. They are probably tuned differently to compensate for this and to get the best mileage possible. And it only requires 91, not 93. Make your own decision and use whatever you want but the Manual states 91.If they were tuned different wouldn't they then get different hp/torque numbers? Why tune it differently in the landcruiser to require 93 but gives no benefit to HP/Torque???
Their curves could be different. For example Lc might be producing more horsepower at lower RPMs due to a difference in tune that allows higher compression at lower RPMs.If they were tuned different wouldn't they then get different hp/torque numbers? Why tune it differently in the landcruiser to require 93 but gives no benefit to HP/Torque???
A proper answer would be directly from Toyota engineering, but sadly they will surely avoid a direct answer. I still think it has to do with achieving an MPG goal for the LC, and given the additional weight and boxy shape, premium fuel was necessary to achieve the magic economy number.You’re not going to get a proper answer that’s going to satisfy you.
I mean they gave us an answer. It is written in the owners manual and on the gas cap. We also know the engine has 11:1 effective compression, which would require something like 92 octane fuel to be fully utilized.A proper answer would be directly from Toyota engineering, but sadly they will surely avoid a direct answer. I still think it has to do with achieving an MPG goal for the LC, and given the additional weight and boxy shape, premium fuel was necessary to achieve the magic economy number.
I still think it makes no sense. They weigh basically the exact same.They are different vehicles in size and weight. They are probably tuned differently to compensate for this and to get the best mileage possible. And it only requires 91, not 93. Make your own decision and use whatever you want but the Manual states 91.
People have been arguing this for as long as the vehicle and Manual have been out. You’re not going to get a proper answer that’s going to satisfy you. Use whatever you want. As long as it doesn’t ping, I guess you’re good.
The manual does NOT say engine damage will result. The is where the confusion lies.Manual clearly says using lower octane fuel can damage the engine. We can discuss if they are being extra careful etc, but they clearly intended the engine to be used with higher octane fuel.
IIRC, I read somewhere on this forum, that our rigs have a slightly more aggressive ‘tune’..But, the Tacoma also employs a turbo with the apparently same engine parameters. Are there differences? Possibly in the computer software?
I have wondered the same thing.If they were tuned different wouldn't they then get different hp/torque numbers? Why tune it differently in the landcruiser to require 93 but gives no benefit to HP/Torque???
There is an even harsher warning below. That says engine damage is possible.The manual does NOT say engine damage will result. The is where the confusion lies. View attachment 7356
Either the LC manual has been revised, or I missed this. What page is this on?There is an even harsher warning below. That says engine damage is possible.
It is one page 641.Either the LC manual has been revised, or I missed this. What page is this on?