Ray, It seems to me that most newer cars recommend 91 octane fuel. I think it is mainly because high octane fuel increases fuel mileage slightly. But high octane fuel costs a lot more than the small increase in mileage. I think that as long as an engine does not make strange sounds with regular …

[image] ClarkTuck: I think it is mainly because high octane fuel increases fuel mileage slightly. You are incorrect. (I am not Ray, BTW) The octane in itself does not increase MPG’s. Only if the engine is tuned to make use of the higher octane, does the MPG increase. [image] ClarkTuck: …

How do I know that you are someone that knows what they are talking about or just someone that has an opinion?

Ray doesn’t ever respond here as far as I know. I can vouch for Mr. Mustang as someone who does know what he is talking about. You are welcome to your ideas but you are a little off base. Most vehicles sold are designed to use regular unleaded 87 fuel . But if it requires premium then that is what s…

Do you think Toyota does not know what they are talking about either?

You don’t. But you posted on the CarTalk Forum looking for answers, I obliged and reiterated what every owners manual says about fuel octane. I just answered your “I think” theories. If you don’t believe my answer, fine, do your own research. It might be fun. I’d suggest reading “Internal Combust…

I like the topic. I disagree that “Most new cars recommend 91 octane.” My estimation would be that maybe 20% of the cars sold in America come with this recommendation. Not a single top selling car model in the U.S. has that recommendation that I know of. Rogue, CR-V, RAV4, Camry, Accord, Civic, Coro…

[image] ClarkTuck: It seems to me that most newer cars recommend 91 octane fuel That is incorrect. [image] ClarkTuck: I think that as long as an engine does not make strange sounds with regular octane fuel it is not doing any harm to the engine. That is also incorrect. [image] Cla…

On page 474 of the 2017 4Runner owner’s manual, Toyota says to use 87 octane or higher (91 research octane). Note that there are two numbers. Research octane (RON) is used in Europe, while the Anti-knock index (AKI) is used in the US and Canada. There is a third index called Motor Octane Number (MON…

@ClarkTuck , you came here asking for an opinion and unfortunately for you making a statement about mileage that is incorrect. Then you have the audacity to challenge one of our respected members when they give you solid, expert, free advice. You might want to sit back a bit and see what the other…

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2017 Toyota 4Runner - Premium fuel

General Discussion

VDCdriver November 12, 2018, 10:07pm 8

That is incorrect.

That is also incorrect.

I think that you need to do a considerable amount of research on this topic, rather than relying on your assumptions.

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2017 Toyota 4Runner - Premium fuel

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