Regular or Supreme Gas?

[Harpenden fjz80]

Hey,
I just got a 95 fjz 80 and just wanted to know what the verdict was on regular or supreme gas? Thanks
Victor

 

[lowbanks]

Just use regular unless you have a knocking (pinging) problem that can't be cured.

On a well maintained, well tuned engine there is no advantage to a higher octane gas (huge advantage to the oil companies).

 

[campoj2]

The horse was beat dead a long time ago on this one. Lowbanks is dead nuts on with his post, the engine was built to eat shi* gas from 3rd world countries.

 

[webelk6]

Just use regular unless you have a knocking (pinging) problem that can't be cured.

On a well maintained, well tuned engine there is no advantage to a higher octane gas (huge advantage to the oil companies).

How about the mid grade version? I use that and today after filling up the cruiser at the tune of $3.84/gallon, I had 2nd thoughts.

 

[alkaline747trio]

Premium, and advance your timing to take advantage of it. Usually burns a little cleaner too...

 

[Brian894X4]

This is probably new information and will probably surprise a lot of people, but I have in my hands a fairly detailed article written in 1993 by a British Mag about the new 1FZ at the time, that specificly says that Toyota claims the new duel knock sensors and engine management system will allow the engine to make more power when using higher octane fuel.

I have no idea if this truly accurate or even possible. All I can do is report what the article says.

Of course, I always use regular and with these prices see no reason not to keep doing that. Besides, the power increase, if true, is probably a bit minimal.

 

[Blue Phoenix]

I think I am going to have to get serious about monitoring my gas mileage. I have long wondered what the difference in mileage would be from a tank of premium and regular in this vehicle. As stated above, it was designed to run on extremely low octane gas if need be, but Im also not sure if the difference would be enough to justify paying 20 cents or more a gallon for the sweet stuff. The next couple of fillups will tell.
In my thinking though, I at least feel like running high octane fuel will reduce engine deposits over time and save me a little money from having to do more maintenance because of it. Someone please flame me if I sound like an idiot!

 

[FirstToy]

That's good to know Brian- it's just like all new Toyota suv's
I accept the knock retard sensors will allow better use of premium but I have to say, "so what?" A tad more power on the 80 is like a tad more fat on a 500lb man's neck... no one's going to notice and it doesn't make any differnce if you do.

Blue Phoenix,
premium isn't any "cleaner" than regular. It doesn't clean the engine any more than regular. That is a function of additives. Higher octane makes the fuel more difficult to detonate (thus less knock and used for high compression engines).

 

[gnx7]

If you plan to have the computer "relearn" and adjust for better fuel quality.... make sure you remove both battery connections for a few minutes AFTER you have put a full tank of 91+ octane in it. Then the computer will relearn and create settings for the better octane in tank.

The Supra 2JZ-GTE is like this where you can put in 100 octane unleaded, remove the battery connections for a few minutes, then reconnect and it allows more boost/timing etc.

How much more power our 4.5i will make with better octane.... and if you will be able to feel it in a 6000lb truck..... who knows?!?!?!

 

[fjfar80]

I will add my $.02 on this one. Since purchasing my truck in 2006 I have always used "premium" fuel or 92+ octane. I have noticed that it seems to run extremely smooth and the one time I used "regular" or 89 octane (due to no other fuel being available) I noticed a difference. The engine seemed a bit rougher and did not seem as smooth when accelerating. Now, the way I look at it the extra $4.00 is worth it when you talk about $.20 more per gallon and 20 gallons going into your tank. Anyway, I have no data to support my observations but; I make sure only the best goes into the truck (oil, fluids, etc.) so, higher octane fuel can't be a bad thing.

 

[lowbanks]

Even though I wear a size 9 shoe, I notice that when I put on a size 13, I run much faster.
I've googled this to death and can't find 1 article to support using higher octane on a well maintained engine if all that's called for is 87 octane.
The cost savings over years (and gallons) of gas purchases would buy you a new engine if you stick to regular.

 

[Pogue]

mine run great on crap

 

[campoj2]

What is the compression ratio of the 1FZ engine?

 

[alkaline747trio]

Even though I wear a size 9 shoe, I notice that when I put on a size 13, I run much faster.
I've googled this to death and can't find 1 article to support using higher octane on a well maintained engine if all that's called for is 87 octane.
The cost savings over years (and gallons) of gas purchases would buy you a new engine if you stick to regular.

Or.....you could save money by running premium because your premium economy is 4mpg better than your regular economy and my engine is pretty damn spotless inside too. But I'm desmogged, tweaked, and my compression ratio is greater than stock.

 

[Ruadhrigh]

Or.....you could save money by running premium because your premium economy is 4mpg better than your regular economy and my engine is pretty damn spotless inside too. But I'm desmogged, tweaked, and my compression ratio is greater than stock.

and not a 1FZ

 

[Hilux]

That's good to know Brian- it's just like all new Toyota suv's
I accept the knock retard sensors will allow better use of premium but I have to say, "so what?" A tad more power on the 80 is like a tad more fat on a 500lb man's neck... no one's going to notice and it doesn't make any differnce if you do.

Blue Phoenix,
premium isn't any "cleaner" than regular. It doesn't clean the engine any more than regular. That is a function of additives. Higher octane makes the fuel more difficult to detonate (thus less knock and used for high compression engines).

Thats exactly right. I maybe wrong, maybe right, but I consider the lower grade of fuel closer to Diesel. And guess why Diesel is so efficient?

The higher grade was explained to me as a harder to burn fuel. In high performance HIGH COMPRESSION RATIO cars, the ping you hear of low test is the gas combusting before the spark a few degree's before TDC. The "high test" lets the engine get to max timing before the ignition. Like Diesel the low test will combust (NOT ignite) with higher compression ratio's....PING!

What is the compression ratio of the 1FZ engine?

9.0:1............22RE's are 9.3:1 they should run on alcohol

 

[alkaline747trio]

and not a 1FZ

Older and less sophisticated.......the 1FZFE has one more knock sensor than I do, and OBDII.

 

[alkaline747trio]

Blue Phoenix,
premium isn't any "cleaner" than regular. It doesn't clean the engine any more than regular. That is a function of additives. Higher octane makes the fuel more difficult to detonate (thus less knock and used for high compression engines).

Premium fuel is where you find those additives that make the engine burn cleaner. Ex: Shell V-Power. Higher octane AND has additives....

 

[Hilux]

Older and less sophisticated.......the 1FZFE has one more knock sensor than I do, and OBDII.

Not all? IIRC 93, 94 have OBDI

Premium fuel is where you find those additives that make the engine burn cleaner. Ex: Shell V-Power. Higher octane AND has additives....

Read my lips, Mar-ket-ing.

Yeah I'm sure, seriously, their is something that differentiates the two, but otherwise I'm not believing all the hype. Hype is whats selling gas to those who don't need it

Like here for instance: https://forum.ih8mud.com/80-series-tech/220692-regular-supreme-gas.html

 

[alkaline747trio]

You're right, not all are OBD2...but they do have the extra knock sensor.

And I agree...that's mostly hype....but premium is where you find the additives, and that's what my point was.