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Mustang GT fuel?

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2morrow

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Just wondering how many of the 87 crowd add things like an Air Oil Separator, a CAI or an exhaust... Cuze really they don't do anything either performance wise(exhaust does add sound at least..but the cost).
If you have all those things with a tune you have a totally different beast. But then again you're not running 87. And probably not worried about fuel economy...

Mine was a night and day difference.

For example, a PP2 on 93.
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millhouse

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91/93 Octane should have already been a pre-buying decision and accepted cost. That is, if you want/expect your Mustang to be as Ford intended, capable of delivering on a daily basis
Ford recommends 87 octane, why should we have been expecting to be required to pay for 93?
 

2morrow

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Ford recommends 87 octane, why should we have been expecting to be required to pay for 93?
No one is requiring you to pay for 93. However, your horsepower and torque figures are made with 93 octane.
 

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Dr. Norts

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Because the EB is no quicker than my stock 89 notchback...and I will never purchase a 4cyl mustang.
Lol? Have to love people who talk out of their butt. What are you going to say next? Your 1989 handles better too? Keep the jokes coming man. I had a good chuckle. :lol:
 

millhouse

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Lol? Have to love people who talk out of their butt. What are you going to say next? Your 1989 handles better too? Keep the jokes coming man. I had a good chuckle. :lol:
My 89 notch ran 13.9 @ 98mph with a catback exhaust. It doesn't take much when the car weighs 3000 lbs flat. It's ok, I understand some people just don't know any better...it's not your fault.

Copy/pasted from another forum after I ran it. Car had dunlop street tires and 160k miles on the clock. Was running in some nice cool Michigan nights.

R/T .731
60' 2.070
330 5.847
1/8 8.969
MPH 78.39
1000 11.683
1/4 13.976
MPH 98.16

Edit: It looks like I was running 17 inch wheels with regular street radial tires. Still had the stock 2.73 gears though!
 
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Ebm

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My 89 notch ran 13.9 @ 98mph with a catback exhaust. It doesn't take much when the car weighs 3000 lbs flat. It's ok, I understand some people just don't know any better...it's not your fault.

Copy/pasted from another forum after I ran it. Car had dunlop street tires and 160k miles on the clock. Was running in some nice cool Michigan nights.

R/T .731
60' 2.070
330 5.847
1/8 8.969
MPH 78.39
1000 11.683
1/4 13.976
MPH 98.16

Edit: It looks like I was running 17 inch wheels with regular street radial tires. Still had the stock 2.73 gears though!

Which one is it? First, you said the car was stock. Then you said an exhaust. Then you said it had different wheels. Frankly, you've lost all my trust after backtracking 3 times. "REAL" stock for stock, the 89 notch was slower from 0-60, slower in the quarter, and was ugly as sin. :thumbsup:
 

millhouse

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Which one is it? First, you said the car was stock. Then you said an exhaust. Then you said it had different wheels. Frankly, you've lost all my trust after backtracking 3 times. "REAL" stock for stock, the 89 notch was slower from 0-60, slower in the quarter, and was ugly as sin. :thumbsup:
LOL, I don’t need your trust and I didn’t backtrack. If I wanted to lie, I would have omitted the catback and 17 inch wheels. Quite frankly, the 17 inch wheels did nothing for traction and likely slowed me down.

There were many bone stock notchbacks that ran 13s back in the day. You can chose to live in ignorance, I don’t care.
 

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millhouse

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Bringing this one back from the dead.

http://newsroom.aaa.com/wp-content/uploads/2017/12/Premium-Fuel-Phase-II-Research-Report-FINAL-2.pdf

Cliff notes:

Premium Vs Regular fuel economy for the 5.0 mustang.

0% (flat terrain) Grade - 0.1%
2% Grade -0.1%
4% Grade -1.0%
6% Grade (Steep Hill) 8%

Consider that premium fuel is on average 25% more expensive than regular, even if you drove only up steep hills, it wont ever come close to making any type of monetary difference worth of fuel economy.

They also did before and after dyno's.

At 2000 RPM WOT
Regular octane - 100rwhp
Premium octane - 104rwhp
Delta - 4rwhp

At 4000 RPM WOT
Regular octane - 246rwhp
Premium octane - 255rwhp
Delta - 9rwhp

Average torque gained - 1.8%
Average HP gained - 1.6%

Page 31 of the report lists the actual dyno.

This pretty much confirms what most of us were saying. Not as big of a difference as most would have led you to believe in HP and Torque.
 

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I spent $31k on my 2017 Mustang GT, tt only gets 94 octane. I didn't buy it for fuel economy reasons.. if I wanted that, I'd by a commuter 4 banger hybrid. Can't comment on power.. cause I never ran anything less then 94 (at $1.20/liter).
 

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Might be different with the 2018 with higher compression and direct injection.

All depends on on what the engineers did with the tune on the newer models.
 
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