Rwgarrison23
Senior Member
I filled up using both gasoline from Shell fuel. I ran 87 and 89. I dont know if it's me but truck seem to like 89 better. What is recommended gasoline for these 6.4? Mines a 2018, by the way.
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The difference between the two octanes may be more noticable in hotter weather. The engine probably doesn't pull that much timing due to knock with outside temps being in the 70s as it would when outside temps are in the 100s. This may be why some people feel the difference and other don't.
Placebo effect probably....just as my engines always seem more quiet to me after i change the oil and filter.You know I've ran 87 for over a year straight in mine and coincidentally today I filled up with 89. I swore to myself the midrange felt noticeably healthier on the way home.
I run 87 when not towing. 93 I I’m on a road trip or pulling a trailer for a long trip
If I’m gonna be off roading then it’s 93 again
The Blue Mule
20hp is a lot, if I buy something 395, 400, 485, I want to use every ounce of power it makes...not worth the weaker gas to me.I wonder how much power you actually gain from using 89 octane. I know in my old Ecoboost 3.5L F150, power went from 365 hp on 87 octane to 385 hp on 91 octane according to Ford. Not that much of a difference, but then again how much would it cost to get 20 hp with aftermarket mods especially in an N/A engine where it would cost you around $400 just to get a 30 hp bump with a tune.