The poll is for the grade, but I don't know about all of the brands around the world.

 

I put Texaco 92 Octane in.

 

Super either mobil, exxon or aamco.

 

Conoco 92 octane only. The hottest brand going!

 

Shell 91, that's high octane here.

 

My company pays for it and dictates what brand/grade I can get. And at $80-100/week in gas, I'll let them. No problems so far.

 

I always use 92 octane and over, as for brands Mobil or Amoco......PEACE....

 

Chevron 93 only

 

Premium...........enough said

 

92 Mobil only.

 

I would use 91 if were available in my area. We have 87, 89, and 93. I use 93 and I usually buy at Crown, sometimes Shell.

 

on occasion i throw in Sunoco 94 octane , but always use Mobil 93

 

Amoco Ultimate if I can't get that either Shell's 94 or Mobil 92 nothing less. Maybe Cam 2 if it wasn't so much $$$

 

shell 93 unless i go to a different shell and pick up the wrong hose and dont realize it until it's already pumping.

 

Amoco Ultimate since the beginning!

 

over here we only get 91 octane now. i think that really sucks. they still even charge the same!!!btw that would be in the bay area (west coast s.f. area)

ximama

 

80-90% of the Gas you buy comes out of the same tank farm and is delievered to Mobil, Exxon, Texaco, Chevron, etc in the same trucks where additives are added at the station.

Other "off the wall" brands are bought as "odd-lot" and sold through brokers and may be refined by a number of Petro companies.

A Good rule of Thumb is if it don't ping at 89 Octane you gain nothing by going higher, For the higher Octane gases Don't burn HOTTER just LONGER, as the octane increases they retard the burn as not to have predetonation, this becoomes a concern in higher compression engines.

Dave

 

80-90% of the Gas you buy comes out of the same tank farm and is delievered to Mobil, Exxon, Texaco, Chevron, etc in the same trucks where additives are added at the station.

Other "off the wall" brands are bought as "odd-lot" and sold through brokers and may be refined by a number of Petro companies.

A Good rule of Thumb is if it don't ping at 89 Octane you gain nothing by going higher, For the higher Octane gases Don't burn HOTTER just LONGER, as the octane increases they retard the burn as not to have predetonation, this becoomes a concern in higher compression engines.

Dave

 

I respectfully disagree. Performance is gained when an engine is fed its recommended AKI/RON fuel. Any higher than recommended, and you're wasting your money because the engine is already running the optimal timing program and fuel map and cannot take advantage of a more burn-resistant fuel index. Any lower, and a modern high compression engine will compensate (without knocking) by retarding timing. The VQ, for example, is one such engine with digital knock management. It won't ping if you feed it 86 octane, but you sure as heck aren't getting optimal performance out of the engine. Whether this is noticeable or worth the extra savings incurred by using a lower AKI/RON fuel, is up to the individual.

 

I have been trying to figure this out as well, the mysterious switch from 92 to 91 octane. I think it is the removal of MTBE oxygenate from the mixture, which I recall increased octane rating. MTBE was found to pollute ground water sources, leaking through most station tanks, so many stations have had their tanks replaced over the past few years. Oh well, I'm willing to give up 1 octane rating for clean water I suppose.

 

I try and use 93 Texaco Premium. sometimes shell premium

 

89+ it all depends on how much money I have

 

93 Octane, Usually Chevron or Shell, but lately it's been Costco gas because it's $1.59/ gallon ofr 93

 

is there a big difference between 91 vs 92? I can either get 91 from all the stations here or Sunoco ultra 94 which I think is like .5c more a liter (I live in canada)

 

I use Sunoco Ultra 94. I know my car, it runs much faster than my 2nd best, Shells 93. For people who always goes by the book, reading whatever, or been told by people "In the industry or those know it all types" that's great for you.

I did my own comparison and by far Sunoco Ultra 94 is right for me.

In the words of Mick Foley, "Have a nice day."

 

ok I'll try it soon

 

I know that a few years back when I had my '69 Mustang and used some cheap gas it did not run near as well as it did with Texaco. The difference in feel and actual power was very noticeable.

 

Amoco 93, but when I need a car wash I get EXXON. I like their wash better.

 

Texaco 91 .The highest gas here in Colorado.
Peace

 

i use 94

 

Chevron or BP brand 93 octane has always worked for me.

 

i always use the highest 92 or 93?

 

Do you notice any difference (between Chevron and Costco)? I always use Chevron also, but the gas price is so high and $1.59/gal is too attractive.

 

Chevron Premium 92 only.

 

the highest octane i ever find in oklahoma city is 91 or 93. does anybody know where i can find higher octane gas?

 

Normally: Mobil 89
At times: Mobil 93

Alternate: Shell 93
Second Alternate: Shell 89

I rarely use Amoco because it tends to burn a little too fast for my taste (probably the oxygenated crap).

 

dang! $1.59/gal? i use chevron 93 octane here in kentucky and i only pay usualy around $1.33/gal. i always use chevron 93 octane gas. and every 2 or 3 months i add some fuel injector cleaner to it.

 

In Kansas City and much of the upper Midwest we've only got 91. Amaco carries 92, but my car doesn't seem to like it much. I've tried Amaco, Phillips, Texaco, and recently Conoco. I don't know what it is, but the Conoco fuel makes my car more responsive. I've even changed between brands just to make sure. It's been well into the 90s lately and my car feels very quick. I can't wait until things cool down.

MTBE is Methyl Tert Butyl Ether which is very nasty stuff. I do environmental engineering and we deal with this stuff on a regular basis. The problem with MTBE is that it is extremely hard to get out of water once it's in. When you spill gasoline, most of it evaporates, but the MTBE is left on the surface and gets washed away. Usually it goes into a water body or the soil. When it gets in the spoil, it goes straight into the groundwater. One gallon of MTBE can make 1 million gallons of water taste funny. MTBE was added in fuel to make cars cleaner burning. As it turns out it makes little difference in emissions, makes for worse performance, and is a nasty contaminant. This was one of those little government emission band-aids that didn't work....like most. As far as I know, MTBE is being phased out. From what I've been told, MTBE messes with octane ratings. This is why you see 93-94 octane in the more smog riden cities. 94 in a smog riden city is like 91 in a clean city. I rarely see the MTBE label at the pumps here. However in St. Louis, Atlanta, and New Orleans I see then at nearly every pump.


Dave

 

Diamond Shamrock or Exxon 93... its down to $1.23 now.. (:

 

92 Octane from Exxon, Mobil and Texaco.