Premium Gas

[fu_im_from_texas]

[QUOTE=Kaotic Lazagna]

can anyone tell my why i was able to get better gas mileage with premium?QUOTE]

This post has gotten

I think your mpg fluctuated because of other factors. A change in temp could cause the tire pressure to change by 10% resulting in better/worse mpg. Maybe you did more city driving? More passengers = more weight, less mpg...

Bottom line, you experianced higher mpg on this tank of gas which could be indepandant of the octane rating. mpg is affected by so many factors, you may never know excatly why that tank was slightly better.

back off topic, engine knock and predetonation are two terms for the same thing...

[Kaotic Lazagna]

[QUOTE=fu_im_from_texas;69779]

Originally Posted by Kaotic Lazagna

can anyone tell my why i was able to get better gas mileage with premium?QUOTE]

This post has gotten

I think your mpg fluctuated because of other factors. A change in temp could cause the tire pressure to change by 10% resulting in better/worse mpg. Maybe you did more city driving? More passengers = more weight, less mpg...

Bottom line, you experianced higher mpg on this tank of gas which could be indepandant of the octane rating. mpg is affected by so many factors, you may never know excatly why that tank was slightly better.

back off topic, engine knock and predetonation are two terms for the same thing...

not sure why either. my factors remaind the same, for the most part. the only difference is that i was driving faster and the gas itself. but i'm not willing to get another tank of premium to find out. lol...

[fu_im_from_texas]

Originally Posted by Kaotic Lazagna

not sure why either. my factors remaind the same, for the most part. the only difference is that i was driving faster and the gas itself. but i'm not willing to get another tank of premium to find out. lol...

one of my best tanks was 42.xx mpg...from el paso to dfw...700 miles of +80 mph...

[barryware]

Originally Posted by fu_im_from_texas

one of my best tanks was 42.xx mpg...from el paso to dfw...700 miles of +80 mph...

My mileage goes to crap at 80+. I get the best at 70 or so. 37-38 mpg is the best I have ever gotten.

[Kaotic Lazagna]

Originally Posted by barryware

My mileage goes to crap at 80+. I get the best at 70 or so. 37-38 mpg is the best I have ever gotten.

that's good for going 70 mph.

[jdium]

[QUOTE=Kaotic Lazagna;69781]

Originally Posted by fu_im_from_texas

not sure why either. my factors remaind the same, for the most part. the only difference is that i was driving faster and the gas itself. but i'm not willing to get another tank of premium to find out. lol...

I'm doing some math...the Yaris has an 11 gallon tank..."premium" 93 octane gas is usually .20 cents more per gallon than "regular" 87 octane gas...that's $2.20 a tank...

If you get 10% better gas mileage with premium, as some have stated (36mpg with regular, 40mpg with premium, etc), then you will be driving as far on 10 gallons or premium as you would be on 11 gallons of regular...

Stop me if I'm losing anyone...

Gas is now above $3 a gallon around my area. You are saving .80 cents if you see 10% better mileage with premium...

I'm thinking this is along the lines of the placebo effect, you believe your more expensive purchase is going to help you, so it does...

Also, how much do you all drive if an extra $2.20 a tank for premium is breaking your wallet? If you drive 10,000 miles a year at 40 mpg, that is about 23 fillups. That is $50 a YEAR...

Sorry for the ramble...but if you believe that premium is helping you, buy it. Scientifically, there is no benefit to running premium in these cars...

[churp]

[QUOTE=jdium;101220]

Originally Posted by Kaotic Lazagna

......

Sorry for the ramble...but if you believe that premium is helping you, buy it. Scientifically, there is no benefit to running premium in these cars...

Don't understand how you can say that! Scientifically, under load the higher octane allows more timing advance before knock (in a 10.5:1 compression ratio car) which is more efficient, using less fuel for the power needed....not under load I agree with you.

[jdium]

[QUOTE=churp;101248]

Originally Posted by jdium

Don't understand how you can say that! Scientifically, under load the higher octane allows more timing advance before knock (in a 10.5:1 compression ratio car) which is more efficient, using less fuel for the power needed....not under load I agree with you.

It is a 105 hp engine, it is ALWAYS under load :D

If what you say is true, why don't the Toyota engineers tell us to use premium?

[Spades]

[QUOTE=fu_im_from_texas;69779]

Originally Posted by Kaotic Lazagna

can anyone tell my why i was able to get better gas mileage with premium?QUOTE]

This post has gotten

I think your mpg fluctuated because of other factors. A change in temp could cause the tire pressure to change by 10% resulting in better/worse mpg. Maybe you did more city driving? More passengers = more weight, less mpg...

Bottom line, you experianced higher mpg on this tank of gas which could be indepandant of the octane rating. mpg is affected by so many factors, you may never know excatly why that tank was slightly better.

back off topic, engine knock and predetonation are two terms for the same thing...

It is on topic...explaining how octane works answers the question. Your better MPG was a result of another factor and is completely seperate from fuels octane.

P.S. the actual term for Predetonation is called "Pinging"...not knocking...a knock normally refers to a rod or valvetrain noise...course...predetonation, bad lifter, rod knock, piston slap...all the same thing, right?

[static808]

[QUOTE=Spades;69789]

Originally Posted by fu_im_from_texas

P.S. the actual term for Predetonation is called "Pinging"...not knocking...a knock normally refers to a rod or valvetrain noise...course...predetonation, bad lifter, rod knock, piston slap...all the same thing, right?

ooops! i meant engine pinging, you are correct! but many use the terms ping and knock interchangeably. either way, higher octane prevents preignition or predetonation, as we stated, and shouldnt be used in our yarii. kaotic's higher mpg may have been cause by better drafting behind cars, a stronger tailwind, who knows! but it definitely wasnt the use of higher octane gas...and i agree that this is definitely ON TOPIC! now, if i started talking about how kaotic's choice of laundry detergent affected his mpg, that would be considered off topic...

--B

[Kaotic Lazagna]

[QUOTE=static808;69893]

Originally Posted by Spades

ooops! i meant engine pinging, you are correct! but many use the terms ping and knock interchangeably. either way, higher octane prevents preignition or predetonation, as we stated, and shouldnt be used in our yarii. kaotic's higher mpg may have been cause by better drafting behind cars, a stronger tailwind, who knows! but it definitely wasnt the use of higher octane gas...and i agree that this is definitely ON TOPIC! now, if i started talking about how kaotic's choice of laundry detergent affected his mpg, that would be considered off topic...

--B

lol...i use Tide for the most part. that was when i was gettin 36-38 mpg. then i switched to All, and i got 39 mpg. really tho...this happened...but there better be no connection or else imma go crazy!

[static808]

[QUOTE=Kaotic Lazagna;69908]

Originally Posted by static808

lol...i use Tide for the most part. that was when i was gettin 36-38 mpg. then i switched to All, and i got 39 mpg. really tho...this happened...but there better be no connection or else imma go crazy!

hahaha, DAMN! i gotta stop using that costco shit and start getting some brand name laundry detergent! maybe if i use fabric softener, my sienna will get hybrid-like numbers...hmmmm...

--B

[Kaotic Lazagna]

[QUOTE=static808;69915]

Originally Posted by Kaotic Lazagna

hahaha, DAMN! i gotta stop using that costco shit and start getting some brand bame laundry detergent! maybe if i use fabric softener, my sienna will get hybrid-like numbers...hmmmm...

--B

oh yeah, i use fabric softener too! it's the one in the clear, navy blue bottle...

okay, i'm getting off topic in my own thread. heh.

[Go4th]

Consumer reports ranked Costco brand Kirkland’s "liquid" laundry detergent number 1 and tide number 2.. FYI.

[Moose]

[QUOTE=Spades;69789]

Originally Posted by fu_im_from_texas

It is on topic...explaining how octane works answers the question. Your better MPG was a result of another factor and is completely seperate from fuels octane.

P.S. the actual term for Predetonation is called "Pinging"...not knocking...a knock normally refers to a rod or valvetrain noise...course...predetonation, bad lifter, rod knock, piston slap...all the same thing, right?

However, when an incorrect fuel is used- i.e., a car requires 93 octane and you use 87, the vehicle's knock sensor can be heard over time. Our car does have a knock sensor, and if it were activated, you would hear, literally, a knocking- not the engine, but the sensor itself. It is a product of the engine having to adjust timing radically to use a lower octane gasoline. The first time someone radically tunes a Yaris without adjusting the air fuel ratio, they will likely hear a knocking- the knock sensor.

Pinging is heard when there is premature detonation, and also when all fuel is not being burned. Folks that use nitrous or turbo without changing spark plugs
often hear pinging.

Will you hear knocking when using 93 octane in a Yaris? Nope.
Will you hear knocking when using 87 octane in a Lexus ES330? Yup.

[Pavel Olavich]

[QUOTE=fu_im_from_texas;69779]

Originally Posted by Kaotic Lazagna

can anyone tell my why i was able to get better gas mileage with premium?QUOTE]

This post has gotten

I think your mpg fluctuated because of other factors. A change in temp could cause the tire pressure to change by 10% resulting in better/worse mpg. Maybe you did more city driving? More passengers = more weight, less mpg...

Bottom line, you experianced higher mpg on this tank of gas which could be indepandant of the octane rating. mpg is affected by so many factors, you may never know excatly why that tank was slightly better.

back off topic, engine knock and predetonation are two terms for the same thing...

Your conclusions that you get better gas milage with premium is VERY UNSCIENTIFIC....profoundly subject to massive error. You drive one time, or one tank and you make such silly conclusions? You can drive the same exact route 10 times, and your milage will vary from time to time because you will drive the car differently, too many variables change, temperature outside, number of red/green lights, how fast you drive, etc...don't over simplify this issue so much!

The fact is, your car is engineered for 87 octane, and to use higher will NOT provide better gas milage, and in fact will show LESS milage.

There is this dillusion all over the net that using premium in a car engineered for regular is better. This is an old wive's tale, and urban myth.

Using premium in your Yaris actual can make it have LESS POWER, lower MPG, and run with less pep. Many believe (I do too) that running too high an Octane will shorten the life of your engine because it is not tuned for higher octane, and this could introduce incomplete combustion, and detonation, which stresses the engine and over time will shorten it's life.

Don't fall into this bullshit thinking....your car runs the best with 87 octane, and it gets the best MPG with 87....don't get sucked into this thinking that spending more $$ for premium is good for your car, better for MPG, and makes it more powerful...this is all a myth.

For our Yaris, HIGH octane = lower power, less MPG.

And engine knock and detonation are the same things....nothing to do with rods, old engines, etc....

[Kaotic Lazagna]

[QUOTE=Pavel Olavich;69923]

Originally Posted by fu_im_from_texas

Your conclusions that you get better gas milage with premium is VERY UNSCIENTIFIC....profoundly subject to massive error. You drive one time, or one tank and you make such silly conclusions? You can drive the same exact route 10 times, and your milage will vary from time to time because you will drive the car differently, too many variables change, temperature outside, number of red/green lights, how fast you drive, etc...don't over simplify this issue so much!

The fact is, your car is engineered for 87 octane, and to use higher will NOT provide better gas milage, and in fact will show LESS milage.

There is this dillusion all over the net that using premium in a car engineered for regular is better. This is an old wive's tale, and urban myth.

Using premium in your Yaris actual can make it have LESS POWER, lower MPG, and run with less pep. Many believe (I do too) that running too high an Octane will shorten the life of your engine because it is not tuned for higher octane, and this could introduce incomplete combustion, and detonation, which stresses the engine and over time will shorten it's life.

Don't fall into this bullshit thinking....your car runs the best with 87 octane, and it gets the best MPG with 87....don't get sucked into this thinking that spending more $$ for premium is good for your car, better for MPG, and makes it more powerful...this is all a myth.

For our Yaris, HIGH octane = lower power, less MPG.

And engine knock and detonation are the same things....nothing to do with rods, old engines, etc....

i don't believe that premium bullshit one bit. i just decided to run some premium through my tank. and i know it wasn't scientific, but i was merely just telling you guys something. i never said anything about "oh i got so and so mpg with premium, YOU ALL SHOULD START USING PREMIUM!" and i know that variables change with every drive, but i kept all the factors that i can control the same.

and i know that the Yaris was engineered for regular (87) gas. it's a friggin' econo car. who would make an economic car that requires premium gas?

i've seen tests regarding different grades of fuel, and the results were that basically, "if your car will appreciate the higher grade, then it'll get a few more hp".