DIABLO GT90

Thank you.

I seem to have figured out how to shift better from 1-2. I think I may have just been letting out the clutch a half second early, so that was almost certainly driver error. But, this still proves a point that to a newb stick driver, the gt500 is easier to drive smoothly than the gt.

Not sure if I ever hit full boost. I hit it pretty hard in third on an on ramp, but dont want to say I floored it completely. It definitely moves pretty well. I'm sure I'll have more opportunities to drive it, and maybe once I get better at driving you guys can ask me to compare things and I will be able to give you accurate feedback.

ace72ace

https://themustangsource.com/f726/27...1/#post6072297

-ace72

Thomas S

Not I! Been using 93 since the firzt fill up.

MARZ

Thanks for that. Christ, you'd think I told the guy I was seeing 50 mpg or something...

Whammer

Then you've been wasting your money because 93 isn't going to give you any better performance than 91.

Double-EDad

I think this is a bit douche-like to "call" in that the official EPA gas mileage rating on the sticker that came on my car says it gets 17 city and 26 highway. So why would 25 mpg be a surprise?

As for the other guy, all I did was convey the conversation we actually had. I wasn't trying to belittle the GT500 in any way. I love them, and after we spoke he showed me his car, which had the EXACT blue stripes I was looking for, and a great sounding exhaust, which he seemed to enjoy showing me. Good guy. Sheesh.

Thomas S

We only have 87, 89 or 93 here.

11SHELBYGT500

Oh I don't know...maybe because those numbers aren't real world, but congratulations on that.

Double-EDad

Same here in Virginia, unlike some unlucky areas where 91 is the max.

Whammer

Then I would probably go with the 89.

Thomas S

91 gives you the full 412, not 89. So having 2 octane more than I need makes more sense than having 2 fewer.

MRGTX

Yeah....we only have 87/89/93 here too. It might offer a small margin of protection against knock when running a 91 tune so IMO it's worth it just for that.

Whammer

Well the 89 might offer some mild performance increase. But you're probably right. Just go with the 87 and save your money. I will bet you won't notice any difference in performance. My 08 Bullitt had the dual fuel programming and you can't tell the difference. It would be almost impossible to feel 10 extra HP...unless your car had 10HP and you bumped it up to 20HP, now THAT you feel!
But a 2.5% gain in HP is NOTHING.

Whammer

Not worth it at all!
Ford designed the car to run on 87, so it's completely safe. Ford is not going to allow you to use a fuel that is going to cause any sort of engine damage. If it says it can run on 87 then it's COMPLETELY safe to run it on 87.

ace72ace

You guys don't have any Sunoco stations around your area? They offer 87, 89, 91 & 93.

Enfynet

So I drive a 2005 GT and have seen 28mpg on the highway... I don't disbelieve 25+ on the 5.0s

Also, in places that have 87-89-91 vs places that have 87-89-93, they still typically have a $0.10 bump to each higher octane level. Given the same price for 87 octane in both places, that would lead to the 93 being the same cost as the 91. Therefore why would it matter if the 91 and 93 offer the same benefits? They're the same price...

Double-EDad

Had Sunocos all over the place around here (Virginia) in the '60's and '70's. I still recall the 1972 NFL trading stamps promotion. I still have my book of them somewhere. You got a stamp @ each visit to a Sunoco, and it was a race in my elementary school to see who could "Collect 'em'all!" & fill their book first.

But ever since the '80's Sunoco has become mostly a yankee thing in my mind - I don't see any in the South anymore, but I recall seeing them everywhere in New York / Canada when I last visited there, and some had like 5 different octanes to pick from: 87, 89, 91, 93 and 95 octane!! Maybe more than that...

Whammer

You probably pay about 25 cents more a gallon for 93 as compared to 87. If you drive your car year round you'll pay at least $200 more per year for gas.
If someone said they could boost your engine 10HP for $200 would you pay it?
Perhaps, but if that same upgrade was going to cost you $200 EVERY year would you think it was worth it?

I'd bet no one would buy that upgrade and everyone would say it's not worth that kind of money just for 10HP (which again would be impossible to feel). So why waste that money on 93 (or 91) octane?

FCMalie

Some people just like running a higher octane gas? I will personally run 91 or 93 most of the time depending on where I am(I do some traveling from coast to coast). It pretty much comes down to opinion anyways, and I prefer to run it. To each his own, but I see no reason to tell people they are "wasting" their money. If I was worried enough about gas prices to sacrifice performance I would have gotten a hybrid.

MRGTX

I'm running an aftemarket tune as implied in the post you quoted.