Premium Gas

[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.

[Kaotic Lazagna]

Originally Posted by Go4th

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

hmmm, i forgot to get detergent when i last went there, that's why i had to buy All...next time i go grocery shopping again at Costco.

[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.