PREMIUM-VS-REGULAR GAS FOR 2024 GT??

[steveo1960]

Interesting considering that Top Tier gas didn't come out until 2004 so it wasn't around in the 90's

True however by top tier I meant brands like Exxon, Mobil, Sunoco vs the off brands . Poor choice of terms on my part. And the second part of the conversation would usually revolve around "but it all comes from the same place" topic. Lot's of urban legends in that discussion.

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[canzaecho]

Get the gas buddy app if you must. Personally I would never, not sure if it damages the engine or not but I would want my 5.0 to operate at optimal performance.

Also, consider getting a daily if you can.

 

[RLE55]

I like it when racing associations/teams/clubs, etc., share their test results as they become facts vs. hypothetical.
https://nasaspeed.news/tech/engine/...-the-debate-over-which-fuel-makes-more-power/

 

[Blue VaporGT]

On thing I do in my car is put ethanol free gas 90 octane, better miles per gallon, slight improvement in acceleration. I have done this by resetting trip counter and full tank...sometimes that gas is also cheaper than higher octane fuel like 91 & 93. I have 30000 miles on the car with zero issues. This improves even more on the highway. I have gt performance pack with active exhaust.

 

[robvas]

I like it when racing associations/teams/clubs, etc., share their test results as they become facts vs. hypothetical.
https://nasaspeed.news/tech/engine/...-the-debate-over-which-fuel-makes-more-power/

In this story, my freshly hand-built Spec E30 M20 engine is rated at 8.8:1 compression ratio.

100% irrelevant when discussing a Coyote engine

 

[GrabThatBlue]

I just found out that almost all our E5 gas stations have 0% ethanol.
The only reason why they are called E5, is that they are allowed to use a maximum of 5% ethanol in their gas, but they don't, so it's technically E0.

 

[RLE55]

In this story, my freshly hand-built Spec E30 M20 engine is rated at 8.8:1 compression ratio.

100% irrelevant when discussing a Coyote engine

Ok, here's a study done by Steeda on the 5.0 coyote.....pretty much same results.
https://www.steeda.com/87-vs-93-octane-for-mustang#versus

 

[robvas]

Ok, here's a study done by Steeda on the 5.0 coyote.....pretty much same results.
https://www.steeda.com/87-vs-93-octane-for-mustang#versus

Zero data in that article

Here is an old as dirt dyno of 87 vs 91 (93?) in a gen 1

I'd like to see timing #'s and knock counts for a drive, same car on 93 vs 87

 

[Kitulu]

Here's a side question, somewhat relevant since its usually the price point of 87 vs 91 that causes us to fill up with 87...

Does running 91 do anything for the average fuel mileage, assuming that your driving habits are the same regardless of which octane you put in?

Here's a side comment to go along with the question: If you are going to chime in with something along the lines of, "you shouldn't worry about mileage in a sports car" or "get a daily driver that gets better mileage," don't. Just close the thread and move on. I don’t care if you think that, it is not relevant to the question, and will not help with the answer.

 

[AZ_Ryan]

Here's a side question, somewhat relevant since its usually the price point of 87 vs 91 that causes us to fill up with 87...

Does running 91 do anything for the average fuel mileage, assuming that your driving habits are the same regardless of which octane you put in?

Here's a side comment to go along with the question: If you are going to chime in with something along the lines of, "you shouldn't worry about mileage in a sports car" or "get a daily driver that gets better mileage," don't. Just close the thread and move on. I don’t care if you think that, it is not relevant to the question, and will not help with the answer.

Well theoretically a hotter detonation means a cleaner burn. But in today's computer controlled engines, I doubt there would be any noticeable difference in mileage.

 

[LouG]

I did the first road trip in mine when it was at 600kms I refuelled twice with 98 (93US) and once with 95 (91US). Driving reasonably gently consumption was the same at 10.7 L/100km (22mpgUS)
I haven't noticed any difference since then, apart from saving 20-30 cents per litre.
But I still use both grades.
Where I noticed a big difference was my last car, a turbo 2L. I went from 98 E10 to 98 non alcohol and fitted new Michelin PS5 tyres, which have low rolling resistance, and consumption dropped from 9.5 to 8.5 L/100kms driven quite hard ( I had some great rabbits ahead).
Both changes helped, but better than 10% less consumption? That's pretty damn good.

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