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Originally Posted by bassman97
(Post 327220)
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. |
Damn...yeah we're at about $3.62 for 87 right now.
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i have a red stang too lol
i use 87 oct for my tune |
That's good but unfortunately it wouldn't surprise me, which is sad. Some people are just, well...
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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.
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im using 93 octane, the gas is 3.69 right now
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Originally Posted by 96TangerineBossGT
(Post 327202)
It was only the cobras that came tuned from the factory for premium.
BTW, I run either BP/Amoco or Shell premium 93. Scott 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. |
Originally Posted by jjtgiants
(Post 327809)
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. 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 |
Originally Posted by Wombozi17
(Post 327114)
Black power:p
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 |
Originally Posted by MachGT
(Post 327835)
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 |
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.
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