"DO NOT USE 93 OCTANE" ?

[Bike007b]

I exclusively use Costco premium (93) unless I'm traveling or not near a warehouse. In those cases I will use whatever octane Shell V-Power comes in at that location. I also make sure I stop at a busy gas station so the fuel is replenished frequently and don't end up with some that's been sitting forever.

Fuel / air mixture is also important. If you are at altitude some states lower the rating (you are getting less “o”). Turbo should help with that and the computer should keep things good. Costco is great!

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[Roll Sound]

How did your gas mileage do when you changed to 93? I'm in same boat, a little over 1k miles with top tier 87 but thinking of just using 93

My mileage is always better with 91.

 

[RideEmCowboy]

Same here in Cali....can only find 91 which I run in my 2.3L ecco.....The motor is designed to run a variety of octanes (mapping takes care of it I assume)....

Here in the SF Bay Area, one of our 76 stations serves racing fuel @ 100 octane @ $9/gal. (It's probably the Sunoco product.) I treated my 5L V8 Mustang to it a couple of times, but will just use the 91 for "Steamboat."

 

[JohnnyBronco]

Ford claims running high octane with increase torque by 1% in the 2.7
I'll stick with 87

It's the 4.8% increase in hp in addition to

I'd say that he has no idea what he is talking about, running higher octane fuel doesn't do anything bad to you engine, if your car or truck doesn't need the higher octane rating then you're just wasting your money.
Ford states that you can use a range of octane ratings, the higher ratings allow you to get more power from the motor, you can use lower ratings you just won't get as much power.
Gasolines octane rating is it's resistance to ignite or start burning. The HIGHER the octane rating, the MORE resistance to igniting a fuel has. Sounds backwards but when you have a high stress or high performance motor it builds up heat faster and if it gets too hot then the fuel ignites before it's supposed to causing engine knock, so with the higher octane fuel that has a higher resistance to burning the fuel will start burning at the exact moment the computer wants it to. So you can be more risky and squeeze more power out of a motor with higher octane fuels.
Turbo charged motors should always run higher octane fuel due to the extra heat that the turbos cause for various reasons. You don't need to waste your money on higher octane fuels if it doesn't need it but the motors in the bronco are good examples of motors that should use higher octane fuel.
I'm confused why he would recommend that you don't use higher octane, so I'm just assuming he has no idea what he is talking about.

If your engine controls cannot compensate go with what doesn't knock. But your Bronco can.

And elevation compensation is muy important. When we did not move to Colorado in the 70s we were informed we would have get our carb rejected to work proper

 

[UNBROKN]

lol, no!
I was so fed up with the BS that I went thru, I just ran for the door! The length of my explanation would be that of a thesis. ridonkulous experience...
What a nightmare it was.

Come on down to Tri-County Ford in Keysville for your next purchase. They treat everyone right.

 

[ALVA DUDE]

Come on down to Tri-County Ford in Keysville for your next purchase. They treat everyone right.

I wish Id known. My dealership was a nightmare!!

 

[t3n2and4]

right on, thank you!! im an avid coscto bubba!

Costco Bubba. That feels like it needs to be a thing.

 

[t3n2and4]

Unpopular opinion, I feel like Top Tier is a scam. I've been using the cheapest possible 91 octane I could find in my A4 for a over decade and 200k miles. No issues to speak of on my end.

It’s about detergent contents that won’t help in a direct injection only engine. Port injected or carbureted can take advantage of the reduced build up and limited carbonization on the valves.

 

[t3n2and4]

To add to your OCD, I don't fill up if I see a tank truck refilling the underground tanks, in my mind, the fuel is being agitated and debris if floating around in it...

Places like Costco maintain and replace the pump fuel filters regularly so debris is not going to show up there. Ma and pa convenience store - that’s another thing. I got a tank that was mostly dirty water at a Texaco years ago. They eventually begrudgingly paid the mechanic’s bill for clearing out the fuel system - I’m just lucky it didn’t ingest a significant portion of water and damage the whole block.

 

[XR650R]

It's the 4.8% increase in hp in addition to

If your engine controls cannot compensate go with what doesn't knock. But your Bronco can.

And elevation compensation is muy important. When we did not move to Colorado in the 70s we were informed we would have get our carb rejected to work proper

Yup. I had to re-jet my motorcycle when I moved to Colorado. Modern cars and bikes can adjust for that on their own.
You only HAVE to use premium fuel if the mfg. says so or you get an aftermarket tune that requires it. My little Fiesta has a custom tune that has to have 93. If it's not available, I have to remap it with a lower octane tune, and it loses quite a bit of punch in the process.

 

[Flathead]

My sales person said the same thing so I just stopped listening to him after that.

 

[wyobronco]

I have an option of ethanol free 91 here, or regular 91. WHich one is the best for this?

 

[SupremoSombrero]

I can tell absolutely zero difference between 87 and 93 in my 2.7L. Zero. I know that using 87 is better for the environment than 93. This is why many states only allow up to 91 Octane. You're throwing away 20-30% on fuel cost and creating worse emissions by using 93.

Don't use 93 unless you are using a tune that requires it.

 

[JoeSpeed]

I can tell absolutely zero difference between 87 and 93 in my 2.7L. Zero. I know that using 87 is better for the environment than 93. This is why many states only allow up to 91 Octane. You're throwing away 20-30% on fuel cost and creating worse emissions by using 93.

Don't use 93 unless you are using a tune that requires it.

in my 2.3, world of difference.

You actually believe in the environment?

 

[EKOBX]

I am doing a little experiment this week with my 2.3A. Last 4000 miles I have used 91, 22MPG and plenty of get up.

Filled with 85 this week, seeing about 19MPG now. Just some things I am noticing.

I’m on my first tank of 91 octane after using 87 octane for 1000 miles. I’ve seen a bump from around 15.3mpg to 16.8mpg. I do a lot of city driving, so was surprised to see the increase. Will see if this continues beyond this tank. I have the 2.7

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