400hp on Platinum only with 91 octane gas?

[NyackRob79]

I’m getting conflicting information online. User manual states 87 octane is minimum required, but (like every other carmaker these days) they recommend 91 for “best overall engine performance”.

Seeing as how no one is going to actually take an Expedition on a dyno, is the 400hp achieved only in 91+ octane? I cannot seem to find a clear answer.

 

[J Ski]

I’m getting conflicting information online. User manual states 87 octane is minimum required, but (like every other carmaker these days) they recommend 91 for “best overall engine performance”.

Seeing as how no one is going to actually take an Expedition on a dyno, is the 400hp achieved only in 91+ octane? I cannot seem to find a clear answer.

Need a Platinum and 93 octane at 5000rpm wouldn’t worry about hp numbers dude. It’s not going anywhere fast

 

[NyackRob79]

Oh, no doubt. And there’s no way I’m spending the cash to fill her 28-gallon tank with 93 octane every time.

The nice thing with GM’s V8 in the Yukon Denali is it hauls with 420hp on 87 octane.

 

[edizzle]

Oh, no doubt. And there’s no way I’m spending the cash to fill her 28-gallon tank with 93 octane every time.

The nice thing with GM’s V8 in the Yukon Denali is it hauls with 420hp on 87 octane.

And the Expy will still outperform it in EVERY measure!!!!

 

[edizzle]

It’s an $80,000 vehicle..........$15 per tank is where you draw the line? You would hate where I live!

 

[Scottorama]

Oh, no doubt. And there’s no way I’m spending the cash to fill her 28-gallon tank with 93 octane every time.

The nice thing with GM’s V8 in the Yukon Denali is it hauls with 420hp on 87 octane.

The Denali 6.2 requires premium to to get the full 420 horsepower. It will run on 87 octane, but you won't get anywhere near 420 HP running on 87.

https://www.vehiclehistory.com/vehicle-gas-type-specifications/gmc/yukon/2017

 

[edizzle]

The Denali 6.2 requires premium to to get the full 420 horsepower. It will run on 87 octane, but you won't get anywhere near 420 HP running on 87.

https://www.vehiclehistory.com/vehicle-gas-type-specifications/gmc/yukon/2017

LOL, typical of the ‘18 haters. Quick to spread misinformation.

 

[J Ski]

LOL, typical of the ‘18 haters. Quick to spread misinformation.

Not misinformation. He is correct that premium is needed to reach 420. Just like the Expedition want more HP, gonna need higher octane fuel

 

[edizzle]

Not misinformation. He is correct that premium is needed to reach 420. Just like the Expedition want more HP, gonna need higher octane fuel

I was agreeing with Scott about Gordon being wrong

 

[NyackRob79]

It’s an $80,000 vehicle..........$15 per tank is where you draw the line? You would hate where I live!

I just didn't realize that advertised HP numbers are all based on 91 octane gas, even though user manuals and "minimum" specs require 87. Lame marketing IMO.

Not misinformation. He is correct that premium is needed to reach 420. Just like the Expedition want more HP, gonna need higher octane fuel

That’s not really how I see it. You shouldn’t have to buy top of the line gasoline to get the advertised HP numbers, when the user manual says 87 (when it’s actually 91). Little truth in advertising would go a long way, such as “400hp (with 91 octane gas)”.

This isn’t some premium European sports sedan. It’s an American truck.