Premium fuel or Regular? GT Coyote V8

[WildHorse]

Shell, as a brand, certainly isn't ethanol free. Sounds like you are talking about a single station.

All shell 91 octane here is ethanol free.

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[bootlegger]

All shell 91 octane here is ethanol free.

Seems rather odd. Is Canada anti-ethanol? Only one Shell station in my area has ethanol free gas, and it is about $1 more per gallon. The Shell I hit is E10.

 

[WildHorse]

Is Canada anti-ethanol

Nah.. shell 91 is the exception. Mostly everything else is e10. Ironically, E85 stations are a very rare thing, even though we have one of the largest ethanol producing plants in N.America.

 

[AdamsRubyRedCS]

 

[Ebm]

I suspect it's because Shell 91 is ethanol free, BP 91, Domo 91+, Esso 91, Husky (all have ethanol) to name a few.
But Ferrari seems to like Shell lol.


I keep hearing that, but have yet to see proof of 'only a 10hp difference'.

I was off by 3 hp... It's a 13 hp difference in the GT from regular to premium. Here is the study old man https://newsroom.aaa.com/2017/12/dont-fueled-premium-not-always-worth-price/

@millhouse tell 'em Milly

 

[Scorpio27]

12:1 compression hight RPM /HP engine and your going to feed it 87 !! you should be Driving a Camry !! we are talking like 3 Bucks a tank difference at that - Common sense aint so common !!!!

 

[Ebm]

12:1 compression hight RPM /HP engine and your going to feed it 87 !! you should be Driving a Camry !! we are talking like 3 Bucks a tank difference at that - Common sense aint so common !!!!

The study was done on a 15-17 model, so it wasn't 12:1 compression... and the manual straight from Ford says 87 is fine. But what do the engineers at Ford know... They only... wait for it... DESIGNED THE CAR! Go troll somewhere else.



Straight from the owners manual of a 2018 Ford Mustang GT. Page 133. "Your vehicle was designed to operate on regular unleaded gasoline."

 

[Scorpio27]

The study was done on a 15-17 model, so it wasn't 12:1 compression... and the manual straight from Ford says 87 is fine. But what do the engineers at Ford know... They only... wait for it... DESIGNED THE CAR! Go troll somewhere else.



Straight from the owners manual of a 2018 Ford Mustang GT. Page 133. "Your vehicle was designed to operate on regular unleaded gasoline."

Thats for all the cheap Bastards that want to drive it like an economy car I will keep putting premium in my car
you can feed yourself mcdonalds and Junk food everyday too lets see your performance and insides when you do that every day TOO!!!

 

[Ebm]

Thats for all the cheap Bastards that want to drive it like an economy car I will keep putting premium in my car
you can feed yourself mcdonalds and Junk food everyday too lets see your performance and insides when you do that every day TOO!!!

I'll reiterate what I said above. A 13 hp difference and maybe 2-3 mpg difference between regular and premium. Just because you think regular gas will hurt your car doesn't mean it's true. Opinions are like anuses... Everyone has one.

 

[Zelek]

I've got a better idea. How about someone show the knock sensor between using 87 and 93 octane during a spirited drive? If the sensor is tripped exactly the same, then the argument becomes the horsepower\timing difference only.

 

[Dr. Norts]

Run your 87 if it makes you feel better but you are leaving performance / throttle response on the table whether you want to admit/believe it or not.

It's the area under the curve and high load situations that you'll see less knock / more timing and this is what matters in every day driving. Not the 10-13hp peak number all those articles quote. 91 is superior up there and as well as everywhere else in the RPM band.

I challenge some who runs 87 do a WOT run 2-3x on the same stretch of road and datalog it. Log knock / ignition timing / rpm / iat / gear # / ambient temperature.

Start the pulls from 2k rpm to redline and post them.

 

[Dudie7]

My current commute is 140+ miles round trip. I'm burning regular until I move closer to the job.

 

[Genxer]

If someone has a tune they should be running the best fuel available. With any engine performance mods why wouldn't you run the max octane? A modder spends a lot of money looking for every last hp they can get, so spending pennies less for fuel doesn't make sense in that scenario.

Just stock and commuting around? Yeah regular or whatever and forget about it.

 

[Ebm]

Run your 87 if it makes you feel better but you are leaving performance / throttle response on the table whether you want to admit/believe it or not.

It's the area under the curve and high load situations that you'll see less knock / more timing and this is what matters in every day driving. Not the 10-13hp peak number all those articles quote. 91 is superior up there and as well as everywhere else in the RPM band.

I challenge some who runs 87 do a WOT run 2-3x on the same stretch of road and datalog it. Log knock / ignition timing / rpm / iat / gear # / ambient temperature.

Start the pulls from 2k rpm to redline and post them.

I'm all for running the 93 tune with 93 octane at the track, but when commuting? Why waste money? Me burning 93 octane commuting back and forth to work is like me taking money and lighting it on fire and watching it disappear.

@Dr. Norts I'll datalog over the weekend under normal cruising, idle, and WOT, and report back here sometime next week.

If someone has a tune they should be running the best fuel available. With any engine performance mods why wouldn't you run the max octane? A modder spends a lot of money looking for every last hp they can get, so spending pennies less for fuel doesn't make sense in that scenario.

Just stock and commuting around? Yeah regular or whatever and forget about it.

Pennies less? lol? Name one place where you can fill up with premium that is just pennies over the cost of regular? Stop with the bullshit.

 

[WildHorse]

Your car will make the most HP with the LEAST amount of octane before detonation. That's a fact. Another fact; Fords Timing and Fuel tables are very conservative. So yeah.. bone stock Mustang running 87 vs 91 not to big of a gap, 87 vs 93 the gap opens up. Tuned 87 vs tuned 91, 91 be like:

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