Premium vs regular fuels

[FRSBRZGT86FAN]

Originally Posted by Zhangy

all engines must be designed to run on 87 octane, 2L boxer engine is no different. using 87 octane will do no harm, because it's the rule. The manual says a lot of things to lower the liability of the manufacturer such as touchless wash only, wash after driven on salty road every time, don't mod your car... you get the point

You have absolutely no clue what your talking this engine is different, doing so repeatedly will create problems

[Zhangy]

Originally Posted by FRSBRZGT86FAN

You have absolutely no clue what your talking this engine is different, doing so repeatedly will create problems

no bro, engine timing auto readjust, works every time

[JohnBgon]

Originally Posted by Legionsk88

i will have to disagree with you on the E85 stations being everywhere, the nearest one from me is a good 20 miles from me, so a 40 mile trip for it, would not be very economical for me.

About 100 miles from me. ...I'm contemplating it.

[FRSBRZGT86FAN]

Originally Posted by Zhangy

no bro, engine timing auto readjust, works every time

No the IAMs drop below 1 at which point it will eventually reach 0 at that level the engine can no longer correct timing to prevent knock, you not only are getting worse mileage and power but you are subjecting the engine to knock and the engine can't counter it. Spreading misinformation helps no one, as you continually post that it's and I quote "all fuel marketing bs", if you've done any tuning or even datalogged the car with the stock tune you'd know this isn't the case.

[gtslow]

Originally Posted by Zhangy

no bro, engine timing auto readjust, works every time

Enjoy arguing this point to the dealer when your car has issues down the road.

[JohnBgon]

Originally Posted by gtslow

Enjoy arguing this point to the dealer when your car has issues down the road.

My dealer filled my new car up with 87 after I spefically told them not to.

I had already made them reorder my car previously for drilling into the front bumper when I also specifically told them not to when I pre-ordered. The salesman got down on one knee while I was sitting in the driver seat of freshly delivered car #2 to inform me and explain how sorry he was.

I ended up getting some octane booster to mix with it.

[Tcoat]

Originally Posted by Zhangy

all engines must be designed to run on 87 octane, 2L boxer engine is no different. using 87 octane will do no harm, because it's the rule. The manual says a lot of things to lower the liability of the manufacturer such as touchless wash only, wash after driven on salty road every time, don't mod your car... you get the point

Please provide source for this. I am very curious as to who made this "rule".

[Nevermore]

Couldn't tell you. My car has always had 93 in it and it will never get anything but 93 (unless I tune it for corn). My choices here are 87, 89, and 93 so even if I wanted to test out 91, I can't. But, manual (and all these fine folks) say 93, so I'd just use 93 if that's what you can get.

(By the way, the upcharge is extremely inelastic. I pay $0.50 extra for premium over regular. That's like, $2.50 extra per tank, 4 tanks a month give or take, $10 a month, $120 a year. That's a pretty cheap premium.)

[Tcoat]

Originally Posted by Nevermore

Couldn't tell you. My car has always had 93 in it and it will never get anything but 93 (unless I tune it for corn). My choices here are 87, 89, and 93 so even if I wanted to test out 91, I can't. But, manual (and all these fine folks) say 93, so I'd just use 93 if that's what you can get.

(By the way, the upcharge is extremely inelastic. I pay $0.50 extra for premium over regular. That's like, $2.50 extra per tank, 4 tanks a month give or take, $10 a month, $120 a year. That's a pretty cheap premium.)

Here (near home as of this morning. prices can vary huge depending on time of day and where in city):
Reg - $3.92 gl
91 - $4.05 gl
93 - $4.51 gl


I use about 20 gallons a week so call it 80 a month.


So, I pay an extra $564 a year for 93.

That is peanuts when you look at the volume I use and the distances I drive!

[Nevermore]

Originally Posted by Tcoat

Here (near home as of this morning. prices can vary huge depending on time of day and where in city):
Reg - $3.92 gl
91 - $4.05 gl
93 - $4.51 gl


I use about 20 gallons a week so call it 80 a month.


So, I pay an extra $564 a year for 93.

That is peanuts when you look at the volume I use and the distances I drive!

Exactly my point. There's no reason to worry about the price of it, which is what I think most people are asking about when they ask whether or not the car 'needs' premium.

[Stratoside]

higher octane rating = higher heat required to burn
higher compression ratio = higher heat from compression

gt86 = has high compression ratio
so you need to use higher octane gas to prevent the gasoline from burning from the compression
- if not, it will cause engine knocking because it will burn before the spark plug ignite it

this will screw up the engine timing

using high octane fuel on a lower compression ratio doesn't do anything, just waste of money

compression ratio is the ratio of the volume of the cylinder when uncompressed vs compressed

[softgrip]

Right next to the fuel cap it says "ONLY USE PREMIUM FUEL".

You'd be stupid not to.

Our premium in Australia is 98RON, I think our base is like 91, and I think we have a 95.

I've only ever filled up on 98 in my past 3 cars - that's 16 years... so I could be hazy on the exact poorman fuel ratings.

[emishor86]

Originally Posted by softgrip

Right next to the fuel cap it says "ONLY USE PREMIUM FUEL".

You'd be stupid not to.

Our premium in Australia is 98RON, I think our base is like 91, and I think we have a 95.

I've only ever filled up on 98 in my past 3 cars - that's 16 years... so I could be hazy on the exact poorman fuel ratings.

yep mate I've gone to the 98 side, I'm just wondering if the seller matters because "Coles Shell" sells 98 for $1.30+ around here but I can go down to 7/11 or United for $1.15+ for the same octane...

[emishor86]

Originally Posted by Tcoat

Please provide source for this. I am very curious as to who made this "rule".

Guys there a new rule! The crickets sound in the "boxer" engine is actually the diesel component! so fill up with diesel! (sarcasm) (no seriously, don't take that seriously)