better mileage with premium on my '03 EXLRES

[jcantanixon]

Originally posted by N_Jay

The more rigorous test was suggested.
When are you starting on it?

*He* doesn't have to. *His* initial test findings were good enough to satisfy *him*.

If you'd like to see some rigorous testing before you'll believe, then you might consider that a personal task. I don't think anyone on here will ever list convincing you of something as a short or long term goal.

Since I prefer to believe another contributing user in his reasonable conclusions rather than blindly discrediting his findings, I'd say that it's great that he's found a way to save a little on *his* driving cost. However, neither my 05 or my 08 has displayed any noticeable change in mpg with 91, so I'll just continue to run 87.

Isn't this why "YMMV" is such a well known disclaimer?

[bigdadi]

I will try out a couple of tanks on premium gas and see the difference & mileage comparing regular unleaded gas. Will report back here.

have 08 VP 4x4 my 2 tanks of regular gas had 15mpg city driving (my regular driving behavior). I changed the drive behavior with speed limits & taking it easy approach in current tank, seems it's helping on mpg in first halful already.

[N_Jay]

Originally posted by jcantanixon
"..Toyota has measured slight differences in efficiency due to octane number even when knock is not an issue "

Which way??

Originally posted by jcantanixon
You might want to cross that one off the list if you're arguing that octane has nothing to do with mpg.

I might want to wait.

[N_Jay]

Originally posted by jcantanixon
*He* doesn't have to. *His* initial test findings were good enough to satisfy *him*.

But should that satisfy others?

Originally posted by jcantanixon
If you'd like to see some rigorous testing before you'll believe, then you might consider that a personal task.

No thanks. I KNOW that any mileage test I could run during my normal driving has sufficient uncontrollable variables to be invalid.

Originally posted by jcantanixon
I don't think anyone on here will ever list convincing you of something as a short or long term goal.

Good. They should be more interested in finding facts, not building myths.

Originally posted by jcantanixon
Since I prefer to believe another contributing user in his reasonable conclusions rather than blindly discrediting his findings, I'd say that it's great that he's found a way to save a little on *his* driving cost.

Sounds good. Did he try recording mileage with and without first doing a rain dance? The results could be convincing.

Originally posted by jcantanixon
However, neither my 05 or my 08 has displayed any noticeable change in mpg with 91, so I'll just continue to run 87.

Sorry to hear that your Pilot is not magic like his.

Originally posted by jcantanixon
Isn't this why "YMMV" is such a well known disclaimer?

Yes, but not "YFMV" (Your Facts May Vary)

[malmon]

Originally posted by N_Jay

There are conflicting STATEMENTS on web sites on just about every single topic.
STATEMENTS on web sites are not FACTS.

If you go to the website links, they are being presented as facts. Its up to you whether to believe or not.

[youbetcha]

Originally posted by N_Jay


Note: (just to piss off the N_Jay Haters)

The cost difference is "real". The mileage difference is "believed".

Agree. It would be impossible to measure this. My gas mileage differs by more than this from one tank to the next, and I would swear nothing about the two tanks of gas was different. Same trips, same gas.

[youbetcha]

OK, I'll continue to entertain everyone, here is one post from a SHELL site and another from EXXON. We can all agree that they would promote whatever they could to sell gas. But neither say "use our higher octane gas because you will see an increaese in fuel economy or power in a normally operating engine designed for lower octane."


=================
http://www.shell.com/home/content/ca...line_tips.html

"Firstly, keep in mind that a gasoline’s octane rating is simply a measurement of the fuel’s ability to resist engine knocking. It does not refer to a substance or to the quantity of energy or power in the fuel. More correctly, an octane rating is often called an “anti-knock index”. "

"Engines in vehicles built for sale in North America are designed to a specified octane requirement to make sure they don't knock or ping (engine knocking reduces the amount of power it can deliver to turn the wheels). Once that octane level has been met, in normal instances your car will not experience more power or better mileage if you use a higher octane fuel. "

"In other words, if your Canadian vehicle owner's manual specifies an octane rating of 87, running on gasoline with an octane rating of 89 or 91 or more will normally not make a difference. "

" ... if the owner’s manual specifies using gasoline with an octane rating of 89 or 91, then that’s what you should use because that’s what the engine is designed and tuned for"

==================
http://www.exxon.com/USA-English/GFM...soline_FAQ.asp

"Why should I use your premium gasoline (91-93 octane) instead of regular (87) or midgrade (89)?
To find out what octane your engine needs, first check your owner's manual. The recommended level is often 87 octane. Some models have high compression engines which are designed to utilize the octane levels of 89, 91 or higher.

Ordinarily, your vehicle will not benefit from using a higher octane than is recommended in the owner's manual. But if your engine knocks or pings at the recommended octane level, you may need a higher octane gasoline to prevent the knock. Knocking may occur under certain conditions. A small percentage of vehicles may knock because of variations in engines of the same model due to manufacturing tolerances, or because of an unusual build-up of engine deposits during the first 15,000 miles of driving. Other factors such as extremely hot weather, changes in altitude or hard driving conditions (like towing a heavy load) may also cause knocking.

Many modern vehicles are equipped with an electronic device that detects and eliminates light knocking before you hear it. The devices suppress knock by retarding the spark. We believe that some of these vehicles may experience some deterioration of acceleration performance, without knocking, when operating under high engine demand conditions. "
=====================
Everyone asleep yet?

[youbetcha]

If your Pilot is benefiting from higher octane gas (and you're not towing a boat on the highway in 90 degree heat or something), then you should get your car checked out. It may be something is wrong, or you have engine deposits.

[N_Jay]

Originally posted by youbetcha


Agree. It would be impossible to measure this. My gas mileage differs by more than this from one tank to the next, and I would swear nothing about the two tanks of gas was different. Same trips, same gas.

Careful or you will anger the Octane Gods, and then they will curse your car into not delivering better mileage with premium. It's too late for me, but you still have a chance.