Watch this for final word on which fuel to use (Hint: Premium fuel matters)

[TripDad]

{Opinion}Americans bitch about the price of fuel, Gas and Diesel, but generally do little to use less.

Two different vehicle models/trims can use all the engine compartment parts but have different cooling characteristics thus different Anti-knock ratings.

 

[JamieZ]

PLEASE CLOG THE INJECTORS ON THIS ENDLESS DEBATE

 

[imann777]

I have filled both grades the 95 Octane and the 98 Octane on my LC250 FE, and not a sligh change on the Fuel efficiency. Never driven like a Jack Rabbit, It is just the same 6.5 Av per Litre. It is just waste of your money for nothing on the higher octane. So in all never going back to 98. Being listening to all kinda Snake Oil theories , whether this is better or that is better to Bed. Stick with the recommendation on Turbo Engines 93/95 as recommended by Toyota.

 

[Thew_Tang_Clan]

My 2 cents (or 65 cents, I guess)....

I came from a 2013 Honda Ridgeline where I filled a 22 gallon tank w regular at $55. Got +/- 320 miles to the tank.

My 2025 LC has an 18 gal tank, filled w NJ premium gas comes to about 55$ and l get +/- 320 miles to the tank.

The differences cancel out for me

 

[Kiet2k]

At the conclusion of this thread, I will consider relabeling my fuel door.

 

[ChrisMA1B]

To add to the confusion a bit - I spoke with my dealer this morning about this issue. He noted that he recommends at least 89 octane for the LC. Reason being that 89 is the minimum octane for that grade fuel, and it is usually somewhere between 89 and 93 octane. 91 octane is a minimum of 91, but often more, and 93 octane (which is what is usually available to me) is a minimum of 93, but could be highter. He also suggested that if going on the highway for a trip, to put a tank of 93 in before leaving.

 

[t3lcfe]

At the conclusion of this thread, I will consider relabeling my fuel door.

View attachment 29076

View attachment 29077

Conclusion: consumers have rights to do whatever you want and take responsibility for what you do.
“save” some $ cents on lower gas grade, or “waste” $ cents on higher gas grade are consumers belief. Do whatever you are happy with and pay for what you choose. Just go on with what you do and no need to convince anyone this is right, that is wrong…No ones in both sides take it.

Toyota by law: do not blame on us Toyota / auto maker for all actions you do that not follow Toyota legal written declaration.

Fair enough.
This endless discussion/argument should be ended here. Let’s focus on something else

 

[t3lcfe]

To add to the confusion a bit - I spoke with my dealer this morning about this issue. He noted that he recommends at least 89 octane for the LC. Reason being that 89 is the minimum octane for that grade fuel, and it is usually somewhere between 89 and 93 octane. 91 octane is a minimum of 91, but often more, and 93 octane (which is what is usually available to me) is a minimum of 93, but could be highter. He also suggested that if going on the highway for a trip, to put a tank of 93 in before leaving.

Whatever that guy from dealer told you. He is not the one you can blame on, except that dealer has “legal written statement”. Trust me, that dealer will never do that.

People just tries to find all kinds of things to convince themselves for their actions. Just please going on with whatever you please with. That is it.

More arguments? Hahah I guess that hundreds mire are coming. Please prove my guess WRONG this time. I want I am WRONG on this guess

 

[ultane]

{Opinion}Americans bitch about the price of fuel, Gas and Diesel, but generally do little to use less.

Two different vehicle models/trims can use all the engine compartment parts but have different cooling characteristics thus different Anti-knock ratings.

Welcome to the asylum TripDad.

 

[ultane]

Conclusion: consumers have rights to do whatever you want and take responsibility for what you do.
“save” some $ cents on lower gas grade, or “waste” $ cents on higher gas grade are consumers belief. Do whatever you are happy with and pay for what you choose. Just go on with what you do and no need to convince anyone this is right, that is wrong…No ones in both sides take it.

Toyota by law: do not blame on us Toyota / auto maker for all actions you do that not follow Toyota legal written declaration.

Fair enough.
This endless discussion/argument should be ended here. Let’s focus on something else

That’s not going to happen. Too many keyboard warriors want to be relevant.

 

[Obioban]

Engine compression is high enough (11.1) that it can knock without boost. Engines with compression ratio in this range requires 96 RON fuel.

Downshifting is an option if it is already not at 1st gear. Towing, crawling etc, are potential situations that the vehicle may be at 1st gear with high engine load. Also, if the engine gets hot enough (i.e extended load) it will start to knock regardless of engine speed due to hot spot autoignition.

Lol. My DD (s85 v10) is a stock 12:1 compression ratio. Where am I supposed to fill up on 100?

A Miata these days has a compression ratio of 14:1.

Chart seems flawed.

 

[TakaraLC]

Lol. My DD (s85 v10) is a stock 12:1 compression ratio. Where am I supposed to fill up on 100?

A Miata these days has a compression ratio of 14:1.

Chart seems flawed.

100 RON is ~94 octane on US scale. That is relatively easy to find.

 

[Obioban]

100 RON is ~94 octane on US scale. That is relatively easy to find.

That chart specifically says octane.

That said, 100 RON would be 96 (95.75 specifically) octane. AFAIK, that's not sold anywhere in the USA outside or race tracks.

Many states max out at 91 octane (95 RON)-- including large car markets, like CA.

... and the 14:1 stock, bog standard Miata, following the trend of that chart, would need something like 105 octane (Yet the Miata owners manual says it can run on 87).

 

[ultane]

A friend of mine used to fill up his hot rod corvette at a local (small) airport with AV Gas. I think it was 100 octane, but don’t quote me on that.

 

[TripDad]

Welcome to the asylum TripDad.

Thank You

 

[Kiet2k]

A friend of mine used to fill up his hot rod corvette at a local (small) airport with AV Gas. I think it was 100 octane, but don’t quote me on that.

AVGas or 100LL has lead in it and other additives to prevent knocking, and we normally would not push the RPMs past 2500 on those little 4 cylinder engines.

 

[ultane]

AVGas or 100LL has lead in it and other additives to prevent knocking, and we normally would not push the RPMs past 2500 on those little 4 cylinder engines.

It was a pre 1975 corvette. 1972 IIRC.

 

[TakaraLC]

That chart specifically says octane.

That said, 100 RON would be 96 (95.75 specifically) octane. AFAIK, that's not sold anywhere in the USA outside or race tracks.

Many states max out at 91 octane (95 RON)-- including large car markets, like CA.

... and the 14:1 stock, bog standard Miata, following the trend of that chart, would need something like 105 octane (Yet the Miata owners manual says it can run on 87).

Because Miata likely keeps the intake valves open during compression cycle to reduce effective compression and/or inject fuel very late in compression cycle to prevent auto ignition. Basically it is not doing 14.1 compression with 87. Miata manual still recommends 91 octane but says 87-90 is ok to use.

 

[qberg]

Most Toyotas that I've seen have 40-50 degrees of adjustment in the valve timing (via VVTi). At the most delayed intake valve timing, the intake valves close 50-70 degrees after bottom dead center, so Toyota also has ways to avoid that higher effective compression ratio.

Toyota Variable Valve Timing. VVT-i (gen.IV)

Toyota Variable Valve Timing review - VVT-i (Gen IV)

toyota-club.net

 

[kmershly]

Lol. My DD (s85 v10) is a stock 12:1 compression ratio. Where am I supposed to fill up on 100?

A Miata these days has a compression ratio of 14:1.

Chart seems flawed.

Slightly off-topic, but the S85 v10 engine in the E60M5 is a mighty nice engine.

On-topic, the gas debate can go on and on, which tells me one thing, really nobody knows other than the engineers and petrochemical engineers.