Regular unleaded vs Premium gas

[WildHorse]

87 octane for better millage? That's hillarious.

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[tokuzumi]

Ethanol free gas will net some better MPGs compared to equivalent octane with ethanol in it.

 

[ctandc72]

Ethanol free gas will net some better MPGs compared to equivalent octane with ethanol in it.

Yup. The funny part? The article even points out that the EPA apparently "adjusts" the MPG rating based on it using non-ethanol gas by something like 10% - because ethanol hurts gas mileage.

 

[Hack]

Every time you run 87 Octane in a Gen III Coyote, that detonation is beating the crap out of your engine, PERIOD.

So when you come in here asking "Why does my engine have a loud thud?" in 18 months, imma chuckle just a bit.

Feel free to buy whatever octane rating you prefer, but 87 will NOT damage your engine.

Yes 91 or 93 might produce slightly more power. Not enough to feel and it might even be difficult to measure a difference, but yes - slightly more power.

They do. But trying to argue that Ford would produce a mass production car (Mustang GT) with an engine (5.0 Coyote) that would possibly be damaged running 87 Octane (the most widely available gas in the country) which could potentially cost them hundreds of thousands of dollars in warranty repair is beyond a stretch. In fact - odds are - Ford tested the MPG rating for the Mustang GT 5.0 using ethanol free 87 Octane.

https://www.fordnxt.com/news/ford-uses-different-octane-gas-to-test-for-horsepower-mpg/

Yes.

 

[Schwerin]

I plan to run 87 in the winter months and 91/93 otherwise.

 

[shogun32]

The only real reason to use 91/93 is if you have a tune for it. Short of track/strip daily driving is more than adequately covered by 87.

 

[tokuzumi]

You guys are only going to get 18 months out of your engine doing that.

 

[Andy13186]

I havent bought 87 since 2004 and it was for a 1989 mercury grand marquis

 

[tokuzumi]

I havent bought 87 since 2004 and it was for a 1989 mercury grand marquis

According to credible sources above, you are on your 11th engine because of 87 octane.

 

[ctandc72]

Don't get me wrong. I'm not saying I run 87 Octane. I run 93 Octane from one or two brands of gas locally. I've done it for years. After tearing down a small block Chevy I built that I put close to 100K hard miles on, I couldn't believe how clean everything was. I was actually kind of pissed I actually tore it down. I only did it because I was selling it to a friend. I'll stick with that seems to have worked for me. I'm just saying 87 Octane isn't going to hurt anything.

 

[Andy13186]

According to credible sources above, you are on your 11th engine because of 87 octane.

Not sure if I understand your point.

My point was the car was 500$ and I had a net worth of like $1200 at the time lol. After I got a decent car in 2005 I only used 93 octane from then until now.

 

[HoosierDaddy]

Don't get me wrong. I'm not saying I run 87 Octane. I run 93 Octane from one or two brands of gas locally. I've done it for years. After tearing down a small block Chevy I built that I put close to 100K hard miles on, I couldn't believe how clean everything was. I was actually kind of pissed I actually tore it down. I only did it because I was selling it to a friend. I'll stick with that seems to have worked for me. I'm just saying 87 Octane isn't going to hurt anything.

That didn't have anything to do with octane. If the gas had any effect on that it was the additives. Stick with top tier gas for the additives. I get the same additives with 87 as I do with 91 (highest octane pump gas in the state).

 

[tokuzumi]

Not sure if I understand your point.

My point was the car was 500$ and I had a net worth of like $1200 at the time lol. After I got a decent car in 2005 I only used 93 octane from then until now.

Trolling because of post on previous page about "So when you come in here asking "Why does my engine have a loud thud?" in 18 months, imma chuckle just a bit."

 

[JCFoster]

This is why we have multiple religions!

 

[Smokey613]

The only real reason to use 91/93 is if you have a tune for it. Short of track/strip daily driving is more than adequately covered by 87.

i am sure you are correct on most locations. Where I am, temps have been in the mid to upper 90s. I filled up with BP 93 driving home from dealership as I am positive it had 87 in it. In less than 100 miles I could definitely feel a difference in the upper rpm range on WOT, especially at shifts. Interestingly I recently watched a VMP video and they were mainly discussing Boostane. During the question answer session, one of the VMP guys stated that on a stock 18 or 19 Mustang 5.0 there was little to no benefit to running Boostane. He did state that the 15-17 5.0 would actually add more timing up to around 95-96 octane. It seems the stock tune is pretty maxed out for 93 octane on the 18-19 5.0.

i recently ran two tanks of 87 and the WOT performance was again decreased like it was when we first purchased it. I just filled it up with 93 and will probably run that until the weather “cools off” then switch back to 87.

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