93 octane to 87

[Blk2015GT]

then why buy a mustang then, why not a Honda Fit

Really?

390hp even with a 10% loss vs. 130hp :frusty:

Again, name a few sporty new cars (not trucks) under $40k with even 390hp. I can't think of even one other now that a Camaro will run you over the $40k mark.

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[jasonstang]

73 posts on the topic so far :lol:


for commuting, just run 87. That's one of the good things about the Mustang. Page 125 of the Owner's Manual has 87 in huge font.

Premium fuel for severe duty, such as trailer tow

Theoretically commuting is not "severe duty", unless you :headbonk:

What's considered severe. WOT from 0-60 is?

 

[paul123]

What's considered severe. WOT from 0-60 is?

I am assuming that with OP asking this question, he is more interested in his cruise control settings than WOT.

but even then, owners manual says "do not be concerned if your engine sometimes knocks lightly, however if it is knocking heavily under most driving conditions while you are using the fuel with recommended octane rating, see your auth dealer to prevent any engine damage"

 

[bluebeastsrt]

What's considered severe. WOT from 0-60 is?

Apparently. People bought their mustangs to tow a 25 ft. Boat to the shore???It's in the owners manual.

 

[jasonstang]

Apparently. People bought their mustangs to tow a 25 ft. Boat to the shore???It's in the owners manual.

Precisely. The manual is very universal to me. It might've just edited version of some other manuals.
Like I said, compression ratio determines what octane is best for the engine and anything above 10:1 should use premium to minimize knocking and maximize efficiency.

 

[Raoh]

Just to clarify, its not that I want to make the switch because I can't afford to keep doing as I have been. My situation has changed, and I just want to limit the amount of extra money I am spending in anyway I can. I had lived in the same place for about 8 years, and I did not foresee moving anytime soon. But I had the chance to move into a nicer place, and I felt it was a great idea. The money I'd save on fuel will go into my savings, I just want to be as frugal as I can for a while so I can get my savings up again. I need to go buy a bunch of stuff for my new place etc. I will probably end up keeping the same 93 fuel in it as I do now. It's not so bad, and I may actually end up driving less to stores and such.

 

[Raoh]

:lol:LOL this is a funny thread. I bet half the people worried about saving a few bucks on gas are buying 5 dollar star bucks coffee. Or smoking 2 packs a day.:doh:

I wanna save some extra money because I am approaching 30, and just feel like I am not doing enough for my future. Love my car, really do. Not a mistake, it's my single most prized possession. But I make all my own food, I build my own computers, make and grind my own coffee, hell, I even grind my own meats and make my own ice creams. I also don't smoke. I am just looking to spend my money in a little more efficient ways right now! I'll probably try a tank of 87 and see how it feels. If I don't like it, an extra 8 dollars a week won't kill me.

 

[paul123]

try the 87. if you don't get any conspicuous knocking then its good enough. You got the 5.0 on the side of the car, and that's half the fun.

 

[Emt1581]

I wanna save some extra money because I am approaching 30, and just feel like I am not doing enough for my future. Love my car, really do. Not a mistake, it's my single most prized possession. But I make all my own food, I build my own computers, make and grind my own coffee, hell, I even grind my own meats and make my own ice creams. I also don't smoke. I am just looking to spend my money in a little more efficient ways right now! I'll probably try a tank of 87 and see how it feels. If I don't like it, an extra 8 dollars a week won't kill me.

I see where you're coming from. I feel the same way. If we have the ability to be a bit more frugal at the pump, why not?? No one has sited any reasons it's be detrimental or even harmful to the car. And most are saying they can't notice any difference in performance anyway.

Now if we were talking about a different car that is actually designed to run on premium fuel, and not feeding it the higher octanes will harm it or hurt it's functioning different story.

-Emt1581

 

[BallisticBurrito]

I see where you're coming from. I feel the same way. If we have the ability to be a bit more frugal at the pump, why not?? No one has sited any reasons it's be detrimental or even harmful to the car. And most are saying they can't notice any difference in performance anyway.

Now if we were talking about a different car that is actually designed to run on premium fuel, and not feeding it the higher octanes will harm it or hurt it's functioning different story.

-Emt1581

Yeah these Coyotes aren't LS1's that REQUIRE premium fuel. If the manual recommends regular fuel then anything more is a waste unless tuned for it.

 

[Bartly]

So my car is going to be my good weather DD, and we get lots of good weather. In a week of owning the GT I find my commute is made up of lots of getting everywhere I go as fast as I can, safely of course, lol. I would call launching at a green light sorta severe duty, but it's only like 3-4 time in my 10 mile commute, well maybe more if I get some good traffic. On the second tank of gas and put 87 in it, got me thinking with my driving style I might jump up to 89 or 91 (just because I don't normally see 93). But I know damn well that the mustang is made for speed as a general design requirement. Just seems weird to think that the engineers designed this engine for HP/torque and stated the recommended octane is 87 unless you are going to use the car for HP/torque? Trying to be funny there, but also half serious.
I am curious on the $ per mile concept having to do with octane ratings. Never thought about it since everything I've had has either been 87 or a diesel. Anyone have any details/charts/graphs/plots on the subject they could share. Trust me I didn't buy my mustang for MPG, anything would be better than what I've been driving for the last decade. Just am interested in data cause its fun.

One last funny. Be interesting to see if the people who are sick of this topic are the ones running 93 octane or the ones wanting to run 87.

 

[watchdog]

you bought a v8 performance car, treat it as such

premium fuel only or get a honda econobox

Fyi for the Honda haters, the Civic SI is 93 octane only.....

 

[Spartan]

V8 takes a 1% hit on 87 octane...not 10%.

Look it up.

 

[Spartan]

So my car is going to be my good weather DD, and we get lots of good weather. In a week of owning the GT I find my commute is made up of lots of getting everywhere I go as fast as I can, safely of course, lol. I would call launching at a green light sorta severe duty, but it's only like 3-4 time in my 10 mile commute, well maybe more if I get some good traffic. On the second tank of gas and put 87 in it, got me thinking with my driving style I might jump up to 89 or 91 (just because I don't normally see 93). But I know damn well that the mustang is made for speed as a general design requirement. Just seems weird to think that the engineers designed this engine for HP/torque and stated the recommended octane is 87 unless you are going to use the car for HP/torque? Trying to be funny there, but also half serious.
I am curious on the $ per mile concept having to do with octane ratings. Never thought about it since everything I've had has either been 87 or a diesel. Anyone have any details/charts/graphs/plots on the subject they could share. Trust me I didn't buy my mustang for MPG, anything would be better than what I've been driving for the last decade. Just am interested in data cause its fun.

One last funny. Be interesting to see if the people who are sick of this topic are the ones running 93 octane or the ones wanting to run 87.

They list that because that is what the engine was designed to run on.

They put the * on the website because ANY bonus # they can get is bragging rights in the HP/TQ wars.

Notice how they didn't do that for the V6...because they don't want the V6 to improve even 1% to bring it closer to the EB. Also notice how they put the * for the EB...needs 93 to get those HP/TQ numbers. If they didn't use 93 the EB would fall below the V6 in HP/TQ.

It's all about sales.

 

[BmacIL]

V8 takes a 1% hit on 87 octane...not 10%.

Look it up.

Peak, yes. There's a 10-15 hp hit in the mid range.

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