Just filled up the tank with 91 octane premium fuel

[ham]

Originally Posted by darkmoon87

Just to feel if there is any difference. (out of curiousity)

I didnt notice any power gain or anything like that, but one thing was quite noticable.


After installing my NST crank and waterpump pullies, the car became more sensitive to clutch and I had a little difficulty starting smoothly from 1st gear.
The car would shake more when I give the gas only as much as I used to give prior to the pulley install, so I had to be extra conscious with my clutch manuvering.

After filling the car up with 91, I can start from 1st gear with a relative ease. It starts noticably more smoothly.

Do u think this is just a placebo thing? Discuss.

I experience a noticeable gain in MPGs from 87 to 93

[427chev]

Originally Posted by ham

I experience a noticeable gain in MPGs from 87 to 93

No you don't...

You might think you do, but objectively speaking there is no difference at all.

[highwaypass]

Originally Posted by ham

I experience a noticeable gain in MPGs from 87 to 93

i agree with you

[jambo101]

Originally Posted by ham

I experience a noticeable gain in MPGs from 87 to 93

Guess your car is different than mine as i see no difference Either through electronic measure or pencil and paper calculation but i guess if you are seeing noticeable gas mpg by paying the extra $$$ for higher octane then go for it , you will be happy with the extra mpg and the gas companies will be happy with the extra $$$$ Win win all around.

[Aothachos]

Originally Posted by ham

I experience a noticeable gain in MPGs from 87 to 93

+2 lol i used to get 60 miles before the first bar went, now i use 91 it goes up to 75-80 on the first bar =), i wasn't satisfied with 60 miles on the first bar

also i had about half a tank of 91and i filled up with 87 and my car ran like crap like i felt it, it was horrible hard to explain but you feel it, like the car is "wtf is this crap your putting in me"



P.S. do you mean 91 or 93 lol

[427chev]

Originally Posted by Aothachos

+2 lol i used to get 60 miles before the first bar went, now i use 91 it goes up to 75-80 on the first bar =)

So you're saying that running 91 octane in lieu of 87 octane increases fuel economy by about 30%..

Wouldn't Toyota simply recommend premium if that were the case? Premium only costs roughly 10% more, yet according to you it improves fuel economy by 30%. That means that running premium is a FAR more economical choice than running regular.

Honestly, anyone can claim anything on these forums. The fact of the matter is that I hold a mechanical engineering degree, have been employed in the profession for 23 years and have read quite a bit about the combustion process and fuel.

Scientifically speaking, your claim is baseless.

[BLAZINBLUEVITZ]

Originally Posted by 427chev

Honestly, anyone can claim anything on these forums.

and this is your claim:

I hold a mechanical engineering degree, have been employed in the profession for 23 years and have read quite a bit about the combustion process and fuel.
.

[427chev]

Originally Posted by BLAZINBLUEVITZ

I've aleady won my argument with you, based solely on that fact that you resorted to (baseless) insults in lieu of a credible response that included objective evidence to back your "opinion."

Time and time again, objective evidence proves my point. In fact, the article below noted that the car designed to run on 87 octane actually ran WORSE on premium. That is not the first time I've seen that happen. I suspect that premium's slightly slower burn time might result in compromised combustion in some engines that are designed for regular fuel.

http://www.caranddriver.com/reviews/...ature/(page)/1

http://www.consumerreports.org/cro/c...l-dollars-406/

"Don't use premium fuel if you don't have to. If your car specifies regular fuel, don't buy premium under the mistaken belief that your engine will run better. The only difference you'll see is about 20 cents more per gallon. Most cars are designed to run just fine on regular gasoline. Even many cars for which premium is recommended will run well on regular. We have found that the differences are imperceptible during normal driving. Check your owner's manual to find out if your engine really requires premium or if you can run on other grades."

[BLAZINBLUEVITZ]

Originally Posted by 427chev

I've aleady won my argument with you, based solely on that fact that you resorted to (baseless) insults in lieu of a credible response that included objective evidence to back your "opinion."

NO, your just a latecomer who thinks their gonna teach someone something with their knowledge. Maybe if this wasn't the 56th thread of the same topic id be a bit more receptive......

[427chev]

Originally Posted by BLAZINBLUEVITZ

NO, your just a latecomer who thinks their gonna teach someone something with their knowledge. Maybe if this wasn't the 56th thread of the same topic id be a bit more receptive......

I have nothing to "Teach" anyone on this board.

Rather, I prefer to ignore children who have no understanding of the related science and will therefore remove myself from this thread.

[twowheels]

Originally Posted by Aothachos

+2 lol i used to get 60 miles before the first bar went, now i use 91 it goes up to 75-80 on the first bar =), i wasn't satisfied with 60 miles on the first bar

I'll call your anecdote and raise you one...

I always run 87 and almost always get 90+ miles from the first bar w/o topping off.

[CrazedEpidemic]

Originally Posted by ham

I experience a noticeable gain in MPGs from 87 to 93

Thats what happened to me when I went to a Shell station that only had 93. I noticed more MPG.