2004_mustang_gt

I was wondering if I should put 91 octane in my 2004 mustang gt, do you think it would be better for the car, etc? I was just wondering if I should start putting premium because it doesnt really say anywhere for gt's. Thanks

JJ03MustangGT

its not recomended, but it will work, you may get hard starts on cold mornins but other than that you should be fine

GThopeful

From everything I've gathered off this site (which could be wrong), it is not really necessary to use that high of an octane without the tune for it. Our cars run just as well on the "low grade" gas as they do on the "high grade" gas, or so I've read. I personally put "mid grade" gas in my 02 GT. Probably doesnt do a damn thing for me, but I do it anyways.

mvr

i put 87 in cuz im cheap... and my car is basicaly stock.

PushinTheLimit

You dont need it. Ford designed the GT's to run on 87. Thats what I put in mine and it ran just fine, never had a problem. I know the 03/04 cobra's have to run 91 tho. You can use it, its just not needed like another guy already said.

mikev08826

LOL...

I'd go with "regular" octane for the regular mods...

FI usually requests higher octane.

kast1376

My booklet recommends 89 octane for my 04, FWIW. (I do not know about other states, but out in CA., 89 is mid-grade)

04BlueGT

I need to re-read my booklet, because I thought mine said 87 and I have an '04, too.

clix813

i know some one that ran theres on the cheap **** wich is 83 for here and it realy jacked up there stang. They had to rebuild the engine at like 70000 miles. they only run 91 which is good for here now.

kylebgt

How do you get 83octane?? Unless you **** in your gas tank after filling up with 87, I dont know of anywhere that carries lower than 87. Anyways I stick with 89, its cheaper than 87+has ethanol. Ethanol FTW!!