Premium Gas

[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?