What fuel do you use?

[Left Coast Geek]

I alternate between 91 and 87, and frankly don't see much difference. I primarily use Costco, otherwise major brand top tier. 4 months and 10000 miles in Mexico, obviously was no Costco and I rather doubt any of it was top tier.

 

[GlennSullivan]

I use 87 locally and on low load trips, but always use 93 premium under high load and towing situations and have proven premium will provide 2-3 mpg when towing.

 

[chuck s]

What's your owner's manual state? My 2017 manual wants a minimum of 87 octane (check) and no more than 15% ethanol (check).

30¢/gallon lower price or over $7 per tank. Not sure what the mpg break even is mainly 'cuz I've never seem it here. Many claim better fuel mileage burning 93 octane but at an extra 60¢/gallon 2 or 3 more MPG doesn't justify the cost, it's more expensive.

-- Chuck

 

[NevadaGeo]

What's your owner's manual state? My 2017 manual wants a minimum of 87 octane (check) and no more than 15% ethanol (check).

30¢/gallon lower price or over $7 per tank. Not sure what the mpg break even is mainly 'cuz I've never seem it here. Many claim better fuel mileage burning 93 octane but at an extra 60¢/gallon 2 or 3 more MPG doesn't justify the cost, it's more expensive.

-- Chuck

It's a matter of choice. The debate will continue to go on. I just figure since I have a performance engine, I should put the best fuel available to achieve that performance. It does make a difference.

Here is a question to the expy community; -Since I live and operate the vehicle at altitude (+5000') and it is wintertime, is it still useful to use a premium blend? Does winter cold warrant a lesser octane fuel? Summers I always use premium fuel, but is premium fuel necessary during winter at altitude? Thanks for any insight.

 

[chuck s]

"Performance engine?" In which Expedition?! Recommended fuel is 87 octane and that doesn't change in winter or altitude -- although you may not find 87 octane above 6000' ASL where 85 is normally all that's needed.

-- Chuck

 

[NevadaGeo]

"Performance engine?" In which Expedition?! Recommended fuel is 87 octane and that doesn't change in winter or altitude -- although you may not find 87 octane above 6000' ASL where 85 is normally all that's needed.

-- Chuck

Hey, to an old minerals exploration geologist that romped around the mountains in F-150s and expeditions for 30+ years, the raptor engine in the expy is a performer!!! It doesn't take much to excite us!

 

[2018ExpyPlatinum]

87, but I will throw 91 in once in a while, especially when it's cheap(er). I do believe it runs smoother and a little better with 91, but maybe it's psychological.

And not to beat this dead horse, the book does say 87, BUT, if you have a platinum like mine, it does say you only get the 400 horses on 93, otherwise it's 375 hp on 87. So if I run 91, what do I have? 390 hp?

 

[SyndicateZ]

87, but I will throw 91 in once in a while, especially when it's cheap(er). I do believe it runs smoother and a little better with 91, but maybe it's psychological.

And not to beat this dead horse, the book does say 87, BUT, if you have a platinum like mine, it does say you only get the 400 horses on 93, otherwise it's 375 hp on 87. So if I run 91, what do I have? 390 hp?

Its either 87 or 93 for me. I dont need all the confused, "I dont know what I am", mid fuels in my gas tank.


I try to run 93 as much as possible tho unless the prices gets ridiculously over $5 a gallon

 

[2018ExpyPlatinum]

@SyndicateZ .....right, me too, but you can't get 93 west of the Mississippi per se (IIRC), so 91 is it.