As the title says, I'm wondering if anyone here consistently runs 87 Octane on their 5.0. I would love to save on my gas bill in return for giving up on flywheel hp, but should I be concerned with engine knock or any other potential negative outcomes?

 

It won't harm your engine. And it won't save you that much money either (unless you drive A LOT)

EDIT: Nvrmind, you're in Canada. I don't know what the gas prices are like there....

 

i run 89 w/ ethanol, very few places around here have 91

 

I saw the manual says it's OK to run on 87, but premium is preferred. I am putting the middle option in my '11. Thought it was the premium, now see it's just Plus. I got 22.07 MPG on my last tank. I am fine with that #. In my '95, I was getting about 15-18. As long as I hear no pinging, I will continue w/89.

 

93, if only I could find it without ethanol...

 

I have been running 87 for low-speed around town driving and filling up on 91 for road trips and/or when I know I'll get the chance to do more spirited driving. I get no pinging or knock with the 87, however.

My MPG (with a 3.73 rear end and 5-speed manual) averages a lousy 12 in the city but a decent 24-26 highway. I have never owned a vehicle before with such a large spread between city and hwy mileage. My '06 GT with an ATX got around 16 city.

I am going to try 91 in town also to see if it boosts my city MPG, although I tend to doubt it will.

BTW, there is a gas station near me that sells 100 octane (!) gas, however it runs $6.39/gallon last I checked.

 

With my CAI and tune, I was told I should be able to run 89 OK. But, I haven't tried it yet.

 

The engine will run just fine on 87. What I buy depends on circumstances. If I'm just going to be driving on the interstate, I'm not going to be putting my foot to the floor anyway so I'll use the cheap stuff. If I think I'll have the opportunity to do some "sporting" driving during the next tankful, I'll go for the high octane.

 

Right now the dollar is at par (ie $1USD=$1CAD) and in my area:

87 Octane=$1.07/L=$4.06/gal
89 Octane=$1.13/L=$4.29/gal
93 Octane=$1.20/L=$4.56/gal

 

Dang $.50/gal difference between 87 and 93? I'd be on 87 all day then lol

 

Here in NorCal the difference is $.20 per gallon, just for reference.

 

Pretty much the same down here. 91 was $3.27 and 87 was $3.05 last fill up

 

93 up here in MA is $3.00 and 87 is $2.60

Still using 93 though

 

I just filled up with 93 Octane today.

 

I just filled up with 93 yesterday at $3.17. 87 is about $2.85. That's in So. Fla.

 

If you don't have a cold air intake and a tune why run 93? I would think you run the 87 until you save up enough to get a new intake and tune! I run 87 in mine with no problems what so ever!

 

for me, ill probably put 91 in always since im used to it. my last 2 cars have been supercharged so 91 is required

 

I have run 87 form time to time and then feel guilty and apologizing to my car when I get in.

 

Same here.. I know I could but I just wouldn't feel right doing it.. 91 all day here..

 

Only a few places near me have 91. So usually it's either 89 or 93. So for about 15 cents a gallon or $2.40 a tank I just use the 93.