Is 91 octane a waste if money for stock GT?

[Woody]

I've had my GT for about two months now and have put premium 91 octane in every time I fill it up. Am I wasting my money?

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[Chameleon]

.

 

[venomisback]

Never use anything less than premium! The engine will blow! [emoji3]


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[ScottsGT]

It's all I use. Cheap enough right now anyway.

 

[v8ter]

Never use anything less than premium! The engine will blow! [emoji3]


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Ive used 87 since day 1,@17,000miles no blown engine

 

[Hack]

Never use anything less than premium! The engine will blow! [emoji3]


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Somehow I'm sensing sarcasm!

I used only 87 on my last couple Mustang GTs. They work great with 87. If you're going to the road course on a hot day, I would recommend premium for that day, though. Also, if it's super hot where you live - on the 100+ degree days it might be nice to have premium in the tank. However, there's absolutely no problem with running 87. You won't notice a difference in power.

Also, around here they make premium by putting more ethanol in the fuel. I prefer not to have ethanol in my fuel at all, but I also would rather run as little ethanol as possible. The engine is built to handle ethanol, but fuel economy suffers using it. There are other reasons I dislike ethanol, but I will stay off my soap box at this time.

 

[highvoltage]

Its runs fine and still has tons of power on 87. As long as you get a decent gasoline your fine. You will get a little more power out of premium but nothing noticeable unless you butt dyno is highly accurate. A tune will get you good gains even on 87.

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[skytop1]

Absolutely YES, regular grade fuel is fully acceptable to your GT. Ford states that fact.

 

[CommyO]

Yes

 

[ForTehNguyen]

[ame]

 

[HETPE3B]

Especially when manual clearly states to use regular unless you are towing something heavy

 

[Blk2015GT]

87 is fine for daily driving; even the manual says so. If you're going on the track of really beating on the engine use 93.

$.60/gallon adds up when you put in 12-15 gallons each fillup. 15 gallons that can save you $9 a fill-up.

 

[Jpjr21]

I use 93. Its not my daily driver so the extra money is no big deal for the peace of mind knowing she's getting the best.

 

[Pnasty]

I had assumed it wasn't beneficial at all, actually maybe worse if the car isn't tuned for 93. Gas is so cheap if there is any benefit at all I will run 93.

 

[CB]

435 horsepower rating for the 5.0 was done with 93 octane rating. It says so in Ford's sales literature and Frontline magazine.

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