Premium Gas

[Moose]

I tried a tank of premium this week, after reading this thread, just to see what would happen. 90% of my driving is usually highway, and half of that is in bumper to bumper traffic. I usually average about 35 mpg. Using the premium, and with a 120 mile mountain run (most of which was spent at 4500 rpm and above) in addition to my normal routine, I averaged 37 mpg.

Will I spend the extra money on premium again? Nah, it wasn't that much of a difference to me. Did it prove to me that you do, in fact, get better fuel economy with 93 octane? You betcha, and I bet that I could've done better without the mountain run, as well.

[Kaotic Lazagna]

Originally Posted by Moose

I tried a tank of premium this week, after reading this thread, just to see what would happen. 90% of my driving is usually highway, and half of that is in bumper to bumper traffic. I usually average about 35 mpg. Using the premium, and with a 120 mile mountain run (most of which was spent at 4500 rpm and above) in addition to my normal routine, I averaged 37 mpg.

Will I spend the extra money on premium again? Nah, it wasn't that much of a difference to me. Did it prove to me that you do, in fact, get better fuel economy with 93 octane? You betcha, and I bet that I could've done better without the mountain run, as well.

cool, cool, this premium stuff is weird.

[Pavel Olavich]

Originally Posted by Moose

I tried a tank of premium this week, after reading this thread, just to see what would happen. 90% of my driving is usually highway, and half of that is in bumper to bumper traffic. I usually average about 35 mpg. Using the premium, and with a 120 mile mountain run (most of which was spent at 4500 rpm and above) in addition to my normal routine, I averaged 37 mpg.

Will I spend the extra money on premium again? Nah, it wasn't that much of a difference to me. Did it prove to me that you do, in fact, get better fuel economy with 93 octane? You betcha, and I bet that I could've done better without the mountain run, as well.

Your 'test' was not scientific....did you every consider that you could fill your tank up with 87 octane and drive your same route 10 times and get ten different MPG results? Your test lacks controls to be able to draw conclusions. Funny how you do your test once, and draw conclusions....did you attend college?

[acrbill]

The Yaris has 10.5:1 compression. It must have a extremely conservative timing curve to allow the car to run on regular. My old Neon ran on premium. It said premium fuel recommended. It did not say required. If I put regular fuel in the MPG would go down like crazy and there would be a noticeable power loss.

IMO any car with that high of a compression ratio should run better with a slower burning fuel in. The real test would be to use a obd2 data logger to monitor the knock sensor and timing with regular and premium. I would bet that you will see a lot of activity from the knock sensor and therefor timing being pulled and fuel being dumped.

[Pavel Olavich]

Originally Posted by acrbill

The Yaris has 10.5:1 compression. It must have a extremely conservative timing curve to allow the car to run on regular. My old Neon ran on premium. It said premium fuel recommended. It did not say required. If I put regular fuel in the MPG would go down like crazy and there would be a noticeable power loss.

IMO any car with that high of a compression ratio should run better with a slower burning fuel in. The real test would be to use a obd2 data logger to monitor the knock sensor and timing with regular and premium. I would bet that you will see a lot of activity from the knock sensor and therefor timing being pulled and fuel being dumped.

It's not just about high compression....the amount of cubic liters comes into play....just because a small engine has high compression does not necessarily mean it requires premium....you need to take the size of the engine into consideration too. The bigger the displacement, the longer it takes for the fuel to burn completely, thereby requiring more octane to retard the burn for a given stroke.

[Black Yaris]

Originally Posted by Pavel Olavich

Your 'test' was not scientific....did you every consider that you could fill your tank up with 87 octane and drive your same route 10 times and get ten different MPG results? Your test lacks controls to be able to draw conclusions. Funny how you do your test once, and draw conclusions....did you attend college?

let us pull that Chino quote again "Do you ever shut up?"

[Moose]

Originally Posted by Pavel Olavich

Your 'test' was not scientific....did you every consider that you could fill your tank up with 87 octane and drive your same route 10 times and get ten different MPG results? Your test lacks controls to be able to draw conclusions. Funny how you do your test once, and draw conclusions....did you attend college?

WOW. I just saw this.

Is this guy still here, or has he been banned?

1) ...did you every consider that you could fill your tank up with 87 octane and drive your same route 10 times and get ten different MPG results?

Yes, and they are usually within .3-.5 MPG each time. I actually do the math and keep a log. That's as close to scientific as we can get.

2) Your test lacks controls to be able to draw conclusions.

As does your opinion.

3) ....did you attend college?

Yes, Georgia Tech. I actually know the science- you think you know the science. And don't try any cute comebacks- I'll just look at my degree and my paycheck and giggle.

Will there be anything else Pavel? I generally reserve arguing on the internet for times when I have nothing more adult to do, but watching you unravel and make a fool of yourself is worth it.

[Pavel Olavich]

Originally Posted by Moose

WOW. I just saw this.

Is this guy still here, or has he been banned?

1) ...did you every consider that you could fill your tank up with 87 octane and drive your same route 10 times and get ten different MPG results?

Yes, and they are usually within .3-.5 MPG each time. I actually do the math and keep a log. That's as close to scientific as we can get.

2) Your test lacks controls to be able to draw conclusions.

As does your opinion.

3) ....did you attend college?

Yes, Georgia Tech. I actually know the science- you think you know the science. And don't try any cute comebacks- I'll just look at my degree and my paycheck and giggle.

Will there be anything else Pavel? I generally reserve arguing on the internet for times when I have nothing more adult to do, but watching you unravel and make a fool of yourself is worth it.

Your testing methods belie your "Georgia Tech" education. Sorry, but it was sloppy....by the way, I'm sure your giggling paycheck would make me laugh off my ass too!

[Moose]

[Black Yaris]

Originally Posted by Moose

where did you find that picture of Pavel?

[Moose]

Originally Posted by Black Yaris

where did you find that picture of Pavel?

Same place I found this one...