1MZFE on regular fuel?

[95WhiteCamry]

i use 87 for day to day driving. when i have to do a 700+ mile commute in one sitting, i throw in premium for the improved has milage. going at a solid 80mph on a really really long stretch the engine feels smother on premium, as i have done it both on premium and regular.

[rty]

When I first got my 97 V6 I did a test, first a tank of 87, then 91. I noticed no difference. Also, the price difference was 10%. So if I spent $2000 a year on gas, that's $200 saved. I might do the test again since I'm more familiar with the car, and gotten a heavier foot. :p

Originally Posted by shajbot

Hey you guys know what happen if you mix like half tank regular half tank premium?

The octane ratings average out.

[Rob_0126]

My 2 cents.

I always use 89 octane, not just for the higher rating, but it seems 89 is a lot cleaner than 87. 87 will gunk your fuel system much faster.

Seems the jump from 89->93 isnt a huge leap, than 87->89 in cleanliness.

Ive used chevron for years, and before Amoco sold out to BP, I used them.

I figure, Im spending .10 a gallon for peace of mind. Ive never had fuel system problems and Ive done this for years in my GM vehicles before.

I do use 93 every once in a while, just for the sake of it all. And I do seafoam the system periodically.

[geoff5093]

Originally Posted by Rob_0126

My 2 cents.

I always use 89 octane, not just for the higher rating, but it seems 89 is a lot cleaner than 87. 87 will gunk your fuel system much faster.

Seems the jump from 89->93 isnt a huge leap, than 87->89 in cleanliness.

Ive used chevron for years, and before Amoco sold out to BP, I used them.

I figure, Im spending .10 a gallon for peace of mind. Ive never had fuel system problems and Ive done this for years in my GM vehicles before.

I do use 93 every once in a while, just for the sake of it all. And I do seafoam the system periodically.

I don't see how people come up with conclusions that 87 octane isn't as "clean", and that it will gunk up your fuel system easier. The difference between lower and higher octane gas is just that higher octane takes longer before it detonates, if you aren't knocking on 87, then you will see no difference going with higher octane.

[stockmover]

Wow...I have been getting 27.2 on highway. City.... I have not calculated because I drive mostly highway to work, 110 miles daily round trip. I did notice that when I used SHELL 93, I got 28 miles per gallon on highway but with the cost difference it was not worth it. The vehicle did start better and acceleration was fast as if I was using the PWR button near the shifter. I try to keep my rpms under 3, the more they stay under 3 the better the gas mileage.

Originally Posted by Black95Cam

been using it since the last or month or so... everything seems to be fine.. drive like a grandma and you'll be impressed by the mpg, at least it did for me.. went from 17-19 in city up to 22-23 mpg and high way went from 22-24 to 25-26 mpg... thats keeping the revv under 2000 rpms.

[Rob_0126]

Originally Posted by geoff5093

I don't see how people come up with conclusions that 87 octane isn't as "clean", and that it will gunk up your fuel system easier. The difference between lower and higher octane gas is just that higher octane takes longer before it detonates, if you aren't knocking on 87, then you will see no difference going with higher octane.

Thats why I was saying that it's nt the octane rating as much as the refining process of 87 vs 89 vs 93.

Seems most oil companies refine the 89 a lot more than the difference in 89->93.

[rty]

Originally Posted by Rob_0126

Thats why I was saying that it's nt the octane rating as much as the refining process of 87 vs 89 vs 93.

Seems most oil companies refine the 89 a lot more than the difference in 89->93.

I don't think it's refined any differently. They just add some additives to raise the octane. I don't work in the oil industry so I could be wrong, but it seems more logical.

[ASG14]

Does anyone read the owners manual anymore? Says 87 (91 recommended for better performance) right in the owners manual.

I drove my car on 87 for almost 3 years, now on 93 simply cause of the SC.

[95WhiteCamry]

Adam...my car came without one

[ASG14]

I swear to God I;m goign to start pulling the Manuals from all the Toyota's in the junkyard and start selling them onb TN, haha.

[94CoupeV6]

The manual says:

"Premium unleaded gasoline, Research Octane Number 96 (Octane Rating 91) or higher is recommended for optimum engine performance".

I don't see where it says to use 87? Use 91 or higher for "optimum performance" it says, and I'm wondering if gas mileage fits under engine performance. I have never seen a thread where someone attempts to see if it is worth the amount of money saved on gasoline at fill up, or if it actually burns more fuel.


Anyways...I filled up today with 89 octane and drove 85 miles on the highway at 70 MPH and it felt fine. Still won't know for sure if there is a consistent difference in gas mileage between the different gasolines.

[94CoupeV6]

Originally Posted by Venom_5

id run 89, but probably not 87, if i were you ... just because from your videos and posts, you probably dont drive like a grandma

like king said, it can handle 87 if babied

I actually don't beat on it at all anymore. Just use it as a point A to point B daily driver.

[Lumberg]

Mine said 89 with 87 allowed if necessary.

They don't sell 89 around here.

The ECU simply retards the timing when it senses knock. Higher octane=less knock=more advanced timing=more power & FE.

I bet you if anything, lower octane would be economical on long highway trips since cruising is low load and not prone to cause knocking. It's taking off hard or climbing a hill that induces knock.

[94CoupeV6]

Yeah but at least 95% of my driving is in the city. It's in a river valley, so I go up a lot of huge hills.

I'll probably just continue to use 89 and ditch 92.

[nikita]

Originally Posted by rty

I don't think it's refined any differently. They just add some additives to raise the octane. I don't work in the oil industry so I could be wrong, but it seems more logical.

It is not refined differently, its just a different blend of the same ingredients. There is no additive, other than lead, which was banned a long time ago that will raise octane rating. Alkylate, a "synthetic" gasoline made by treating Cat Cracked Vacuum Gas Oil with a strong acid, is used in higher proportions in premium grade gasoline. In most of the country, gasoline is E10, with ten percent ethanol, which does help raise the octane rating as part of the blend.

The myth that regular is not as clean and will clog fuel injectors is based on history, not current reality. They used to put detergents only in the higher grades. That is no longer true. You do get more detergents in "name brand" fuels, such as Chevron, Shell, Mobil, etc, than economy brands like Valero. The octane rating makes no difference. So, I buy name brand 87.