Gas Octane

http://www.torquecars.com/articles/fuel-octane-ratings.php

 

Wow guys...just read your owner's manual.

My manual RECOMMENDS 91+...so I use 91+.

My dad's Suburban RECOMMENDS 87...so I use 87 when I drive the Suburban.

Not that hard, fellas.

 

I'm running 85 and the Taco doesn't mind it at all.

 

Unless your truck is supercharged or turbocharged there is no reason to buy premium gas. Our truck engines are not high compression ratio engines, therefore do not need premium gas. Go ahead and buy the more expensive stuff If you have alot of expendable cash.

 

GTFO

Link

 

MM oil in the fuel does lubricate the fuel system and the upper cylinder area so I use it in my off-road motorcycle fuel, 2oz per 5 gal premium. I really work that moto engine hard so it will benefit from the added lubrication. Have not used MM in any of my cars or trucks because I don't work those engines nearly as hard. Plus I'm afraid it would gunk up the cat with long-tem use (off-road bikes don't have cats... yet). You could put a few ounces MM oil in the engine. I have done that for years with good results (the cyl hones on my 65 mustang were mirror perfect and you could still see some cross-hatches after 120k miles, great compression, I just had to take the head off for valve guide replacement.)

I have seen an increase in fuel economy about 2mpg using Lucas Fuel Treatment. No I don't work for Lucas.

 

HOLY MOTHER OF GOD..i should use 91/93..JERSEY GASOLINES THE CHEAPEST!! =)

 

My 89 3.0 v-6 would ping on anything less than 91,but I also got 26 mpg. My 09 Quad Cad gets 87 unless i am pulling my motorcycle trailer then it gets 91. There is a difference in the gas mileage between 87 and 91. With 91 I get 17mpg with the trailer and 15 mpg on 87, plus I can't use the overdrive on 87....over all under normal driving i get 15-17 in town and 20-22 on the highway. And yes I drive like an old man. But My Harley gets 43mpg.................

 

89 unless I go for a very long drive I'll use 91. Want power, performance, etc. Go for the racing fuel.

 

I ran 10 gallons of 100 octane "Velocity" when I was in Pasadena, CA last week. There was under 5 gallons of 91 oct in the tank when I filled it. I paid 8 dollars at the pump. It was 5 dollars a gallon when I was in high school, that was fifteen years ago.

Acceleration was marginally better... that's about it.

 

All I use is 93 and it runs like a champ!!!
-Last tank of gas i got 401 miles/17.1 gallon=23MPG

 

Many modern vehicles (since the early 1990s at least) adjust ignition timing to compensate for lower-than-optimal octane. If the vehicle is designed to tolerate 87, but to take advantage of 89 or 91, then you will get better performance on 89 or 91 even though you don't get pinging on 87.

 

used 91 for the last 2 tanks, not a bit of difference, execpt the price about $6 - $8 more per fill up, needless to say I will be going back to 87 next fill

 

87 for my 4 bangah.

every time i put 92 its slower, gets worse mileage and runs a bit rougher lol

 

I still get 15-16mpg with 93, same as the 87. I don't get as much pinging. I think I'll drop down to the 89 and see what that does for me. I'm on my 5th tank of 93 with no noticeable difference. My phone has a neat app to track my mileage history.

 

Fuel 'octane ratings' have very little to do with engine performance in modern vehicles which have not been considerably modified (ie-modified cylinder compression ratios). Modern engine controls, such as variable valve timing, computer controlled ignition & fuel delivery events, & most other emission/performance control components, have rendered the 'higher octane' argument obsolete.
Octane ratings were used in a time when cylinder compression ratios were the main 'tool' for performance gains, today however, they seemed to be used as a marketing tool to increase oil company profits from the uninformed..

Here are a few links to learn what 'octane' really means;

http://www.green-planet-solar-energy.com/what-is-octane.html

http://science.howstuffworks.com/gasoline3.htm

http://auto.howstuffworks.com/fuel-efficiency/fuel-consumption/question90.htm

 

Agree 100%! (EDIT: And that makes us both wrong. Sort of.)

High compression engines cause preignition, heard as pinging. It is the gasoline self igniting under pressure during the compression stroke before the spark. (like a diesel) To make it practical to design higher compressions into an engine, a way was found to increase the self ignition pressure of gasoline, and that was by using additives to increase octane which makes the gas less explosive. That's all you're getting for your extra dough.

If Toyota's engine was a high enough compression to need higher octane fuel, it would be in the owner's manual that 91 or higher octane fuel is recommended.

I don't have a Taco manual yet. Does it say that?

When I had a 2004 4Runner with a V8, it did say that in the manual. As a result, I used 93 octane all the time. Truck ran like a scalded rabbit as soon as you put your foot into it. But, ... it was the higher compression that gave the performance; not the higher octane.

 

This article from Wikipedia sums up any question about possible advantages of using higher octane fuel than an engine is designed for.

 

Well, I just looked up the 1GR-FE on Wikipedia.



87 OCTANE
Output is 236 hp at 5200 rpm with 266 lb·ft of torque at 4000 rpm

91 OCTANE
Output is 239 hp at 5200 rpm with 278 lb·ft of torque at 3700 rpm

There you have it. This engine is designed to use higher octane. However, it should adjust and run smoothly on 87 octane.

Check out the Wiki page. It is very interesting.

 

Yeah, this is what many of us have been saying since day 1...higher octane is not required, but there is a real advantage. The 1GR ECU is apparently able to open up some extra timing with higher octane and thus produce more power. People can pick their poison...economy or engine output.