What fuel do you use?

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#31

04-26-2008, 11:02 AM

Must See

8-2=6

Join Date: Dec 2005

Location: Houston,TX

Posts: 3,196

Quote:

Originally Posted by bassman97

That's not smart since our cars aren't designed for it. Hope you didn't corrode anything since E85 requires it's own tune and stainless steel fuel components.

As for me, 87 since that's what Ford says. 89 if I know I'm going to do some beating but that's it. 91/93 is pointless unless you engine is tune for it.

As for brand, Exxon/Mobil, BP/Amaco (Ford recommended), Valero, and Shell are the best. Getty is junk, haven't used Lukoil but gf says it's good, Sunoco is great but dirty, and Citgo is borderline. Anything else is a mixed bag.

Im pretty sure Jack was joking. I know he is not that dense.

#32

04-26-2008, 11:06 AM

SRQ

Florida Muscle

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Join Date: Apr 2008

Location: Sarasota, Florida

Posts: 134

Damn...yeah we're at about $3.62 for 87 right now.

#33

04-26-2008, 11:28 AM

Redrum

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Location: Humble,Tx

Posts: 524

i have a red stang too lol
i use 87 oct for my tune

#34

04-27-2008, 09:07 AM

bassman97

blank

Join Date: Jun 2006

Location: North Jersey

Posts: 2,451

That's good but unfortunately it wouldn't surprise me, which is sad. Some people are just, well...

#35

04-27-2008, 03:05 PM

BigDipper

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Join Date: Feb 2008

Posts: 23

No I didn't get a different tune.My car is slightly moddified (intake /exuast)The owners manual state's 87 octane for GT as well as the v6 , and 91 for the Mach 1.

#36

04-27-2008, 03:11 PM

3.8LMustang

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Location: Corpus Christi, Texas

Posts: 2,107

im using 93 octane, the gas is 3.69 right now

Last edited by 3.8LMustang; 04-29-2008 at 10:57 AM.

#37

04-29-2008, 10:52 AM

jjtgiants

Join Date: Jan 2005

Location: Dublin, CA

Posts: 4,177

Quote:

Originally Posted by 96TangerineBossGT

It was only the cobras that came tuned from the factory for premium.

BTW, I run either BP/Amoco or Shell premium 93.

Scott

Mach 1's require 91 octane, which is premium in some states...at least Cali anyway....same as the Cobra I believe.

It cracks me up how many people think that if a stock car calls for 87 octane and you put 91 octane in the tank you'll get a performance increase.

Last edited by jjtgiants; 04-29-2008 at 10:57 AM.

#38

04-29-2008, 12:12 PM

96TangerineBossGT

Senior Member

Join Date: Aug 2005

Location: NC

Posts: 466

Quote:

Originally Posted by jjtgiants

Yes I forgot about the Mach 1s (as I live in a 94-98 mustang world myself), but the point is that a factory GT is NOT tuned for premium.

I will say though, that I did notice a slight increase in mpg while running premium on the stock motor, but the increase was probably offset by the increased price. Also, when I tore the motor down to do my head/cam swap, I did not find any excess buildup or anything out of the ordinary. So, will it hurt anything, not likely. Is it worth it? Probably not.

Scott

#39

04-29-2008, 12:54 PM

MachGT

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Join Date: Jan 2005

Location: Iowa

Posts: 650

Quote:

Originally Posted by Wombozi17

Black power

darn skippy!

I use 91 because that's the highest you can get in most places in Iowa... A lot of stations have 89 is the highest.

I've got reason to get the higher octane though

#40

04-29-2008, 02:59 PM

3.8LMustang

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Join Date: Apr 2008

Location: Corpus Christi, Texas

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Quote:

Originally Posted by MachGT

darn skippy!

I use 91 because that's the highest you can get in most places in Iowa... A lot of stations have 89 is the highest.

I've got reason to get the higher octane though

damn only 91 octane, that sux man, were i am the highest is 93 octane

#41

04-29-2008, 03:35 PM

Archer1

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Join Date: Apr 2008

Location: Northern California

Posts: 12

In the May issue of Modified Mustangs Joe Dasilva says he's seen 05's, especially GTs detonate under load on 87 octane. So my next tank will be 91 octane. In the summer my Yamaha R1 will ping even on 91, so I have to be careful not to short shift it. No engine is ever going to be harmed by using too high an octane fuel. But if you don't need it you shouldn't waste the money.