93 Octane?

[Longhorn248]

Originally Posted by maxeveland

20 cents more is a lot to pay per gallon, especially for a car that is in the $25k range.

No, it's really not.

Originally Posted by Grimlock

At 12000 miles per year and 25 miles per gallon, the 20 cents extra per gallon is only $96 per year, which is $8 per month.

Here's the calculation:

(miles per year) * 1/(miles per gallon) * (extra dollars per gallon) = (extra dollars per year)

So in the example: 12,000 miles/year *1/(25 miles/gallon) *($0.20/gallon) = $96 per year extra with premium fuel.

So you are willing to spend $25,000 on an unnecessary, impractical sports car, and then proceed to put a lesser fuel in than required (which will degrade performance of the car), to save $8 per month?

Also, if gas was $2.00 per gallon, the extra $0.20 cost for premium fuel is 10% of the cost of the fuel. At $4.00 per gallon, the $0.20 premium is only %5 extra cost for the fuel. So as gas prices rise, the 'extra pain' of putting premium fuel gets less and less.

Can you see why others have said that if you can't afford premium fuel, you can't afford to buy the car? It's being penny-wise and pound-foolish. Especially in a car that is supposed to make you want to actually use the horsepower it comes with. The math doesn't lie.

Even if it were $200-$300 extra per year over regular gas it shouldn't be a problem. If $25 a month is going to break your bank then you shouldn't be purchasing a brand new car, simple as that.

[Jokerz]

Originally Posted by maxeveland

20 cents more is a lot to pay per gallon, especially for a car that is in the $25k range.

You'll actually end up spending more on gas in the long run depending on your driving habits. Lower grade gasoline will cause the engine to "knock," in order to prevent the engine from knocking the knock sensor will send a signal to the the ecu to delay timing decreasing performance. This is where your driving habits come into play, if you intend to drive this car like a sports car, on lower grade gasoline you won't get the same performance due to the delay in timing, so you gas it more dumping more fuel into the engine then you really "need" too.

Things like elevation and temperature effect the way the engine operates and burns gas but that's not really something I want to get into.

The cost of the car has no barring on what type of gas is needed for the engine. Due to the tighter tolerance of engines in newer cars and the increased compression ratios' expect to see things like higher octane gas and even full synthetic oils being required for even the cheapest of new cars. Buying a car you assume the responsibilities of taking care of the car, know what you are doing before you think it "Doesn't matter."

Of course if you intend to drive like a granny disregard everything I've said

[Ranatsu]

I think this thread boils down to people need to learn to take better mechanical care of their car if they want it to perform as advertised.

[ajc209]

Here in the UK we have standard "premium" RON 95 which is slightly higher that AKI 91, but not much. I know that most reasonably highly tuned engines need RON 98 to get the BHP and efficientcy they specify. You can use RON 95 but the car will not output as much power. Some of my mates would put in normal RON 95 in their Golf GTI/Focus ST/Pergeot RCZ/Rocco for driving around, but when they wanted to have some fun, they would fill the tank with RON 98 and reset the ECU.

What I am suggesting is that it is highly likely that the engine has knock sensors and thus can retard the timing accordingly when low octane fuel is detected. In fact I am confident the GT 86 engine will have knock sensors sicne 99.9% of car engines do these days. So if they suggest AKI93/RON98 that will be for the rated power output (197BHP). If you put in AKI 87 it shouldnt damage the engine, rather the timing will be adjusted and it will no long be the same efficientcy or have the same power output.

I doubt they would design an engine that could be damaged by adding the lower octane fuel, when it is so easy to avoid. I understand someone could add diesel which will break it, but that cannot be avoided. However knock sensing is easy and a well understood technique.

[xwd]

I really can't believe people are asking whether they should run 87 or 91/93 in a car which will likely have "Premium Fuel Only" on the gas door... I wouldn't trust what Scion twitter people have to say on the subject...

Unbelievable...

[Grimlock]

Originally Posted by dwx

I really can't believe people are asking whether they should run 87 or 91/93 in a car which will likely have "Premium Fuel Only" on the gas door... I wouldn't trust what Scion twitter people have to say on the subject...

Unbelievable...

You reminded me of a picture I took of the pre-production BRZ at the local dealer.




What I'm advocating is that putting regular gasoline in the car is a fool's errand. It reduces horsepower, reduces fuel economy, and saves virtually no money on the cost of the fuel alone - let alone the extra cost of the reduced fuel mileage.

[Jokerz]

Originally Posted by Grimlock

What I'm advocating is that putting regular gasoline in the car is a fool's errand. It reduces horsepower, reduces fuel economy, and saves virtually no money on the cost of the fuel alone - let alone the extra cost of the reduce fuel mileage.

This in a nutshell

[Tbxgz]

Originally Posted by Grimlock

What I'm advocating is that putting regular gasoline in the car is a fool's errand. It reduces horsepower, reduces fuel economy, and saves virtually no money on the cost of the fuel alone - let alone the extra cost of the reduce fuel mileage.

Skip the morning latte and boom you've already broken even

[scorcherjf]

penny wise, pound foolish...

[carbonBLUE]

Originally Posted by maxeveland

20 cents more is a lot to pay per gallon, especially for a car that is in the $25k range.

20 cents more a gallon is a lot when your parents buy you a car... lol or when you dont drive one.... shit last night i went on a drive and put 90 more miles on my car, i spend 15 dollars just to enjoy driving and not getting me anywhere... it was fun

[Capt Canuck]

Originally Posted by carbonBLUE

20 cents more a gallon is a lot when your parents buy you a car... lol or when you dont drive one.... shit last night i went on a drive and put 90 more miles on my car, i spend 15 dollars just to enjoy driving and not getting me anywhere... it was fun

That's it! I went for a longish 100+ miles drive through the canyons near where I live, just for the fun of it a couple weeks back.
How much did that cost? IDK? I put $20 in on my way out of town to make sure I would get back around. That comes out of my poops and giggles allotment and cost what it cost.

If you are a sales rep doing 50k miles a year, fair enough your company really needs to worry about mpg and as a commuter doing 20k a year it should be a consideration. But if you are driving a sporty car and do not want to treat it right with high octane petrol, what else are you going to skimp on? Pick the pump that is furthest to the right* and live with the price, whatever it is :-)

*Unless that is where the diesel pump is obviously ;-)

[tranzformer]

Originally Posted by Grimlock

It's being penny-wise and pound-foolish.

Originally Posted by scorcherjf

penny wise, pound foolish...

Echo.....

Originally Posted by Grimlock

What I'm advocating is that putting regular gasoline in the car is a fool's errand. It reduces horsepower, reduces fuel economy, and saves virtually no money on the cost of the fuel alone - let alone the extra cost of the reduced fuel mileage.

Originally Posted by Draco-REX

Also, it's very likely that with lower grade gas you will actually see mileage DROP. So some of that savings will go out your exhaust pipe anyways.

Do you guys have some real world evidence of this? Or just stating what you think will happen. Btw I am going to run premium fuel but not because I want better fuel economy. But because it is the best thing for the car and the right thing to do.

[Ranatsu]

Originally Posted by tranzformer

Echo.....






Do you guys have some real world evidence of this? Or just stating what you think will happen. Btw I am going to run premium fuel but not because I want better fuel economy. But because it is the best thing for the car and the right thing to do.

Obviously we don't know what this car does, but I know in my car if it pulls enough timing it switches to the failsafe fuel map, which is stupid rich.

[Capt Canuck]

Originally Posted by tranzformer

Do you guys have some real world evidence of this? Or just stating what you think will happen. Btw I am going to run premium fuel but not because I want better fuel economy. But because it is the best thing for the car and the right thing to do.

If you google - EVO petrol test vw golf bmw - you might find their test they did a few years back running different RON rated fuel and I am sure other motoring mags have done as well.