Octane for gt dd?

[Chameleon]

87 is fine then swap if you get a tune.

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[Digital_Synapse]

93 cause racecar

Lmao! That's my best friends answer to everything.

 

[DivineStrike]

I have gotten better gas mileage on 87 than I have on 93. With my other cars i've gotten better on 93, strangely to me it is opposite with the mustang. Then again I haven't really done an entire road trip on 93 yet since the motors been broken in, so it's hard to tell really.

I typically use 93, however on road trips i run 87 because throughout the trip it'll save me about $50. Occasionally at home i'll put in 87 but not often. I'll probably start doing it more often as premium has been increasing in price over 87 quite rapidly over the years. It used to be only .20 over regular, then a year or two ago it was only .30. now just about everywhere I go it's near .50 more over regular. It's getting a bit ridiculous. Gas companies are trying to recoup lost profits anywhere they can due to low oil prices i guess.

The engine seems more lively and smooth on 93, but I don't think I can really tell any actual difference in acceleration beyond how the engine responds. But the manual says 87 is fine, so I am perfectly comfortable running that in it. However for spirited driving, track days or autocross... I'd recommend 93, not just for the slight performance gains but to minimize any timing pull that may happen. Sure the engine can protect itself, but I would think that an engine that doesn't have to pull timing is healthier than one that does.

 

[Terminated]

if you add it up over a years time, then its a decent amount of difference. that difference could be mods or food lol

Who needs food? The diet of your Mustang should be priority #1 lol

 

[craigsix]

why buy a high performance car if your worried about paying a little extra for 93 octane!

 

[pinero61]

I run 93 in everything. It's not much of an up-charge for a better quality of fuel.

 

[JRuss]

Hey guys. I used the search button but couldn't come up with anything :/

What octane do you use on your mustang gt for dd?
The guy at dealer told me I could run the 87. any thoughts on this? I am concerned of damaging the engine over time if I end up using 87 like dealer advised. I do understand with premium gas the car will do better performance wise.
Any thoughts?

I've been running 93 the last three tank. I see no difference in fuel mileage or seat of the pants. According to Ford engineering the difference between 93 Vs. 87 is a loss of about 1%. Not worth the extra cost to me. Maybe if I went to a tune I would feel differently but after screwing with tunes in my C5 & C6 Corvettes I doubt that is going to happen.

 

[Lowrider]

Before I bought my car, a Ford lady sales manager gave me a ride in her GT/PP and she mentioned that using 87octane would yield in poor gas mileage...Now that I think about it deeply. Can someone share what gas mileage they have been getting with running 87 vs 91/93?

NVM...Seen post above

 

[Derek@Lethal]

Before I bought my car, a Ford lady sales manager gave me a ride in her GT/PP and she mentioned that using 87octane would yield in poor gas mileage...Now that I think about it deeply. Can someone share what gas mileage they have been getting with running 87 vs 91/93?

NVM...Seen post above

Just to continue from the post above you and kind of debunk what the Ford lady told you, you would actually see better mileage with 87 during regular driving because it will burn more complete at lower temps, but that's why 87 is also more prone to detonation in high load situations.

 

[Horde5.0]

I switched back and forth for a few months between 87 and 91. The 87 seemed to be good for around 1-2 miles per gallon more. The performance difference was there but not crippling. I mostly get 91 or 89 now.

The difference between 87 and 93 might be greater but 93 octane is yet another thing you generally cannot get for your car in California so I wouldn't know.

 

[King_V]

Ok, maybe this has come up before, but I'm curious...

Are there actual power/torque curves (hopefully from Ford) that plot those values for each of the commonly available octane levels? Say, 87, 89, 91, and 93? (And maybe 92? I've seen some gas stations sell Premium here in NJ as 92, though, not sure how common that is elsewhere)

I lean toward 93 for now because it's a weekend-only car, and there is more power . . uh . . despite the fact that I've never pushed it to its limit yet. So, yeah, I'm not saying my logic makes 100% sense. I guess a sort of "if I want to, it's there" thing.

But I've heard everything from 5 to 40 being the horsepower difference on the 2015 Coyote using 87 vs 93. I've also come across "the torque curve is flatter" with 93, but again, not seeing graph across its entire RPM range, that doesn't really tell me much.

I'm figuring somebody must've done some analysis like this, and I'd be surprised if Ford didn't do so...

Yeah, I may not feel much difference via butt-dyno, but it's still something that would be nice to have a definitive piece of information for.

 

[Evolvd]

The difference between 87 and 93 isn't very significant when you're talking about an NA motor. Stick to tier 1 gas stations and I bet you won't notice one iota of difference. If you get a bad batch of 87 your ECU will sense more knock and pull some timing which will in turn reduce available power but unless you're running a forced induction with a 93 tune, you don't need it.

 

[JRuss]

Ok, maybe this has come up before, but I'm curious...

Are there actual power/torque curves (hopefully from Ford) that plot those values for each of the commonly available octane levels? Say, 87, 89, 91, and 93? (And maybe 92? I've seen some gas stations sell Premium here in NJ as 92, though, not sure how common that is elsewhere)

I lean toward 93 for now because it's a weekend-only car, and there is more power . . uh . . despite the fact that I've never pushed it to its limit yet. So, yeah, I'm not saying my logic makes 100% sense. I guess a sort of "if I want to, it's there" thing.

But I've heard everything from 5 to 40 being the horsepower difference on the 2015 Coyote using 87 vs 93. I've also come across "the torque curve is flatter" with 93, but again, not seeing graph across its entire RPM range, that doesn't really tell me much.

I'm figuring somebody must've done some analysis like this, and I'd be surprised if Ford didn't do so...

Yeah, I may not feel much difference via butt-dyno, but it's still something that would be nice to have a definitive piece of information for.

According to Ford the loss is 1% from 93 to 87 octane. My math equates that at 4.35 HP and less then that at the rear wheels.
One of the auto magazines said you'll never know the difference. I know I didn't feel any difference or see any improvement in fuel mileage. I don't doubt with a tune you will do better with the HP increase but I'm all done with tunes after having one in my C5 & C6 Corvette's.

 

[DivineStrike]

According to Ford the loss is 1% from 93 to 87 octane. My math equates that at 4.35 HP and less then that at the rear wheels.
One of the auto magazines said you'll never know the difference. I know I didn't feel any difference or see any improvement in fuel mileage. I don't doubt with a tune you will do better with the HP increase but I'm all done with tunes after having one in my C5 & C6 Corvette's.

That would be 4.35 at the crank ;) and the 40 hp loss is probably in reference to the ecoboost

 

[MDRN]

It's 70-80 cents difference between 87 and 93 octane for me. I'll be sticking to 87 unless I get a tune done down the road.

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