You're not very anything are you?

 

Actually , I am very one thing for sure, for everything else i have people for that

 

I always try to understand the logic in using regular to "save money" when you're driving a car that was at least $30,000, lol.

13 gallons @ $3.50/gallon = $45.50
13 gallons @ $3.70/gallon = $48.10

Thats a difference of $2.60 for the entire fill-up. I'll keep using the premium because if two bucks is going to impact me, I need to trade the car for a Prius...

 

How about in comparison to Shell? I've always put Shell 91 exclusively

 

Where did you get a mustang with a 13 gallon tank? ...and you not thinking long term, youngling. 3.00 x 52 you're saving 152.00 a year instead of wasting it on 10hp of daily driving. You're never using peak horsepower cruising around town.

 

If you use straight kerosene it will get you an extra 42 Horsepower.

 

You've obviously never ridden around town with me.

 

 

Wow so surprised to see that many of you on here have responded this way. This is one of the more intelligent forums I am on... Or so I thought. 91 octane or "premium" fuel is recommended due to the compression ratio of this motor. This 11:1 compression ratio is rather high, and is necessary to use fuel that deflagrates at a higher temp/pressure. Now these vehicle do have adjustable timing and "can use" lower grade fuel as well, but the motor is then required to pull timing and the engine doesn't operate as efficiently as it was designed to. I know on the 11/12 you lose 10 hp and a similar amount of tq on regular fuel, again, the engine is not running like it is designed to. So it's pretty safe to assume (yea I said it) that you will lose a similar amount of power in the 13's

 

Wow those other forums must be full of morons that can barely type if this place is one of the more "intelligent".

 

True.. Cause there are some real winners here.

 

You do understand that EVERYONE agrees in this thread that you lose power with 87 but the car will still function properly, right?

Not sure what that rant was about?

 

Run whatever it says in the owners manual.

 

Try living in Canada.
The different between 87 and 91 is around $0.14/litre
times 60 litres
So thats over $8 per fillup.

What you guys in the US are paying is pretty reasonable.

Still don't understand why we pay so much for gas here. I think the coversion would be equvalent to just over $5/galon
And more so why the octane levels prices are so far apart.

 

Haha, no, not everyone agrees. I read many posts on here that people were talking about how it's not worth the extra 20 cents per gallon or about who cares about the other 10 hp, and one guy was pissed off that someone "assumed" the power loss.

All I'm saying is that the owners manual says to use premium and that the engine operates more efficiently.

Go back through and read every post word for word and you'll see what I'm talking about

 

I will be putting 93 in from now on after driving half a tank on it. I'm already getting better mileage. She screams a little more when you give her good things to drink. Ahhh, universal truths, they just come out sometimes.

 

Alright here's my $0.02
I have been using 87 for every-day commuting and cruising on the highway. While doing that I make the occasional blast, and I can feel it pull timing when I get into the upper RPM's. The stock engine calibration is set to run anything from 87-91 octane. It continually monitors the knock sensors and pulls timing any time there is a hint of knock. Now for when I take the car to the track, whether it's the drag strip or road course, It gets premium. I will make sure to run a full tank of premium before getting to the track as well so the computer has had time to make the timing adjustments.
From what I have noticed, the car DOES get slightly better fuel mileage running 87 vs. 91/3... I manage to average about 20-21 MPG in my normal commute. When it gets premium, I see 19-20 on average.

 

My owners Manuel say 87 octane ....no where does it say use 91 for the full 420 hp.

The link posted by cinque35 is the first time I've ever seen that ....maybe CDN cars are different ? But it's discussions, no one in this threas was "pissed of"

ROLMAO !

 

 

The engine is running like it was designed when you're running low octane. It pretty much says this word for word in the owners manual