- Nov 27, 2025
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I was beating the topic to death with baseless speculation.
I thought that comment was hilarious.
Fuel Grade?
- Thread starter Don A
- Start date
I thought that comment was hilarious.
I think this has been covered a bunch here if you search. Premium is recommended. It's what I run. I knew it when I bought it. Technically you can put whatever you want in it if you want to save a few bucks or just buy the 4Runner.
- Nov 27, 2025
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Don A:
I use premium because there is a decal inside the fuel door that states Premium Fuel Required.
Right now it hurts filling up. .
Based on all the baseless speculation, do you think it is possible a 4runner running regular and an LC running premium have non- identical tunes and this was just a bizzare coincidence????
I see a few , of course, baseless dyno runs out there suggesting a stock 4 runner gets pretty darn to close to the 325/465 numbers..but an LC gets a statistically significant increase in HP and torque. It is in the forum..Happy hunting.
The emissions concept actually makes a fair amount of sense! and of course the premium potentially giving the LC a 1mpg mileage bump for its stats on the Monroney can't hurt either. Just more baseless opinion. The auto industry is full of BS like this and will continue.
In the end, some people will never question authority.......let's see if LC shows an HP bump at its first refresh....my gut says zero change is needed. Very convenient for passing CAFE down the road if you can say the ECU is unchanged
I see a few , of course, baseless dyno runs out there suggesting a stock 4 runner gets pretty darn to close to the 325/465 numbers..but an LC gets a statistically significant increase in HP and torque. It is in the forum..Happy hunting.
The emissions concept actually makes a fair amount of sense! and of course the premium potentially giving the LC a 1mpg mileage bump for its stats on the Monroney can't hurt either. Just more baseless opinion. The auto industry is full of BS like this and will continue.
In the end, some people will never question authority.......let's see if LC shows an HP bump at its first refresh....my gut says zero change is needed. Very convenient for passing CAFE down the road if you can say the ECU is unchanged
- Nov 27, 2025
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We should start a poll.
Who is using Premium, Mid-Grade, Regular, and/or non-ethanol.
Who is using Premium, Mid-Grade, Regular, and/or non-ethanol.
post a new thread on the subject and include the poll, inquiring minds want to know
Toyota will never reveal the tuning maps for any of their vehicles including Land Cruisers, us customers can only do dyno runs to get a feel for what the OEM tunes are like. But dyno runs for full time 4WDs with different grades of gas cost time and money. Stillen did some on a Taco and put it on YouTube btw. It's way better keep making more posts on this forum about fuel grade instead!
I would say using fuel from a solid station like Shell, Chevron, etc rather than Kroger or bobs discount gas is much more important than worrying about octane. That being said I do use Premium, but have the tactical minvan with a COBB tune for Premium so there is that 
But more time and money than the CAFE savings they get? Especially on ~80k units sold? A tune that they already probably developed when designing the engine? I find it hard to believe they don't test the different octane ratings during development.
If anything, I think it's always best to stir up as much misinformation as possible. Maybe someone won't be able to resist the urge to be right. That's how classified tank specifications keep getting leaked on Warthunder Forums... Steam Community :: Guide :: List of Classified Document Leaks
Side note, do people really feel a difference with these tunes? The dyno curve looks like it only makes a drastic difference after 3000 RPM, but it's pretty rare that I actually need to wring out the power train that far.I would say using fuel from a solid station like Shell, Chevron, etc rather than Kroger or bobs discount gas is much more important than worrying about octane. That being said I do use Premium, but have the tactical minvan with a COBB tune for Premium so there is that
100%. They have a few modes but defiantly shifts and drives better. After adding the lift and larger tires it brought it back within stock performance on 93 OEM+ The Sport mode tune defiantly gives it a noticeable power/acceleration gain but at the cost of 13 vs 15 mpg avg (on the lifted + larger tires)
Use 91 or you will burn in hell. My second cousins' daughters' friend dated an engineer that once heard in the refinery bathroom from someone he couldnt see that they also heard in the cafeteria by one of the cooks that you have to use 91 or die. So there. You must. The end.
But at last use Top Tier Gasoline certified stations. No, all gas is not the same. Plenty of studies out there about that subject.
But at last use Top Tier Gasoline certified stations. No, all gas is not the same. Plenty of studies out there about that subject.
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They’re pretty much all supplied by the same regional fuel refiners, so I wouldn’t assume Shell/Chevron gasoline is inherently “better fuel” than Kroger simply because of the brand on the canopy.I would say using fuel from a solid station like Shell, Chevron, etc rather than Kroger or bobs discount gas is much more important than worrying about octane. That being said I do use Premium, but have the tactical minvan with a COBB tune for Premium so there is that
The meaningful differences are the additive package and the station’s storage. A Texaco station in the middle of nowhere on a poorly traveled road is more likely to have problematic [old] gas than a Kroger in a busy residential neighborhood.
- Nov 27, 2025
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My nephew on my wife’s side of the family who works at the refinery was the guy in the bathroom the engineer your second cousin’s daughter’s friend dated that he could not see but could hear. You are correct my wife’s nephew told me that same exact thing when he heard I bought a new LC. He heard it from a Toyota employee who was related to a senior Toyota Engineer’s first wife and was telling a friend in the refinery bathroom. I’m not risking it either.
Definitely agree with the fresh gas theory, many years ago I was driving my WRX home on I 5 some where between LA and SF, filled up with supposedly 91 from Chevron! Bout 2 hours later it really started to hesitate and lose power. I took it to the dealer and they said "oops you put regular in by mistake!" Their solution, drive it till the tank almost empty then refill with 91. It took almost 1000 miles to drive the bad gas out of the tank. I've run both 91 and 87 in the LC and it's never behaved like my '07 Subaru did. The Subaru would really hesitate as soon as the turbo spooled up. The LC still pulls smooth regardless. I've seen no mpg loss with 87 too.
Yes it's common for engine tuners to specify a grade of fuel that the tune is optimized for. For example, there's could be a tune for E85, another tune for 87 (like a 4Runner/Taco), a separate tune for the Toyota Crown, high performance/octane race gas tunes, etc. Most people do not have inexpensive access to an AWD dyno. Imagine the possibilities! There could be dyno tests of fuel grades all the way from 87 to 94+, depending on the geographic area/fuel suppliers.
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