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Old 07-16-2005, 09:28 AM #46
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20/20 Gas article, middle of the page
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Old 07-16-2005, 11:46 AM #47
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Those of you that know you should run premium gas in a new 4Runner should do it. After all the oil companies need their extra profits, too. The marketing of premium gas is like the marketing of lots of products. You don't know you need it until someone tells you. And it's not all that bad. You only loose some money when you line up at the gas pump. But you must remember, if a friend of a friend of a brother had an engine blow up because he accidently ran regular, then you must always do what smart people do, learn from the mistakes of others. Just remember that the extra two-bits or so, per gallon is going to a worthy cause.
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Old 08-18-2005, 02:30 PM #48
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Fuel Injector cleaner

I disagree with the assesment of fuel injector cleaners. A product like BG-44k cleans cdeposits that gasoline leaves behind on injectors and the backs of the intake valves if used every 7500 miles..
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Old 08-29-2005, 08:22 AM #49
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Here are some facts:

When I put 89 octane in the computer says I get 10% better mpg than when I put 87 octane in (I reset it the computer at each fillup). I didn't check the mileage the manual way....so can't say for sure the computer mpg was right.

Why would the computer calculated mpg be higher with 89 octance?
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Old 08-29-2005, 07:16 PM #50
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Quote:
Originally posted by Chenango21
Here are some facts:

When I put 89 octane in the computer says I get 10% better mpg than when I put 87 octane in (I reset it the computer at each fillup). I didn't check the mileage the manual way....so can't say for sure the computer mpg was right.

Why would the computer calculated mpg be higher with 89 octance?
I promise you that the computer readout is way off. Check it the manual way. Its the only accurate way to get your MPG!
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Old 08-29-2005, 07:57 PM #51
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Quote:
Originally posted by Boaz
I promise you that the computer readout is way off. Check it the manual way. Its the only accurate way to get your MPG!
I think what he is saying is that his mpg are better using 89 versus 87 and he used the computer for the measurement. If the computer is off it would be off the same using 87 or 89 so the 89 seems to work better for him.
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Old 01-09-2006, 10:03 PM #52
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I use medium in my 97 4runner and it works a lot smoother. I dont know about power, but in the higher RPM i'm sure its a lot smoother and easier on the engine. Ive never tried premium in my car.
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Old 01-10-2006, 10:10 AM #53
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One thing I've heard concerning this is that the grade of gas degrades with time. Say you put in 89 Octane and don't drive the vehicle for 3 months (extended trip, say military deployment)....if you were to test the octane after it had sat for 3 months, it would be 87 octane or below. Stabil would help stabilize the fuel's octane and help it from varnishing/gumming up anything in the fuel system, if used....

My question is does anybody know how quickly octane degrades, or is this just hype from the Stabil makers?
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Old 02-11-2006, 01:12 PM #54
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Well as far as turbo or supercharged applications a higher grade gas isn't suggested for better performance but to decrease the risk of detonation.
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Old 02-11-2006, 03:12 PM #55
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I have found that my MPG number goes down on my computer when I used regular fuel. I didn't imagine the number changed. When I looked at the readout, the number was lower for MPG when I used the lower grade fuel.
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Old 06-19-2006, 07:14 PM #56
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Ok...for 2006

Well, I've read every thread on here, and there seems to be just as many saying that premium is a must, as there are saying it is a waste and not to believe the owner's manual. I currently have a 2002 Nissan SE-R Spec V, that I'll be trading in shortly. I'm very interested in a 2006 4Runner Sport Edition 4WD V8. The gas mileage is the only thing holding me up. The actual mileage is one thing, but adding to it that Toyota is recommending premium is another. I've called more than one dealer in my area and have heard both responses:

1) It will run fine on Regular (87) unleaded and will not void warranty.
2) You have to run premium or you'll get knock and ping, damage your motor, and void warranty.

Will the 2006 i-Force V8 (or the 4.0L V6) run fine on regular to save money or is premium a must? The 4Runner says premium but the Tundra says regular. I'm confused. Please help as this sways my decision towards a 4 Runner or a Camry SE V6
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Old 06-19-2006, 07:31 PM #57
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Re: Ok...for 2006

Quote:
Originally posted by mikeynavy1
Well, I've read every thread on here, and there seems to be just as many saying that premium is a must, as there are saying it is a waste and not to believe the owner's manual. I currently have a 2002 Nissan SE-R Spec V, that I'll be trading in shortly. I'm very interested in a 2006 4Runner Sport Edition 4WD V8. The gas mileage is the only thing holding me up. The actual mileage is one thing, but adding to it that Toyota is recommending premium is another. I've called more than one dealer in my area and have heard both responses:

1) It will run fine on Regular (87) unleaded and will not void warranty.
2) You have to run premium or you'll get knock and ping, damage your motor, and void warranty.

Will the 2006 i-Force V8 (or the 4.0L V6) run fine on regular to save money or is premium a must? The 4Runner says premium but the Tundra says regular. I'm confused. Please help as this sways my decision towards a 4 Runner or a Camry SE V6
I've used regular since day one in my 2003 V8. Never had a problem. I get about 19 mpg average driving conservatively. I tried premium for a couple tanks but didn't see any noticeable improvement in performance(under normal driving conditions. i don't race civics at the stoplights...) or better mileage. You will not void you warranty.
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Old 06-19-2006, 09:32 PM #58
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Great news. In fact, I just went and test drove a V8 4 Runner and V6 4Runner for comparison. The V6 seemed nice and powerful, but I could definitely feel the increased power under the V8. I also test drove a 2007 Camry SEV6. Nice car, but not as fast as I thought it would be. My little Spec V, while not being as quiet or smooth, feels faster. Knowing that I don't get nailed twice (low gas mileage AND premium) I think I'm going to go for the V8. 19mpg average isn't bad for an engine that size. My modified 2.5L I-4 is getting about 22 mpg avg.
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Old 06-20-2006, 12:00 AM #59
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Yeah, the V8 is the same one they use in the Lexus GX470. It's quiet, smooth and powerful. It also has a nice growl when you step on it.

Speaking of stepping on it, keep in mind that 19mpg is what I get driving fairly gently. If you have a heavy foot, it could easily drop to 16mpg!
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Old 07-19-2006, 01:15 PM #60
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I did some research in this area for a project in my Thermal Dynamics class in University and I found the same information.

While doing my research back then I stumbled across some interesting studies on water injection. From what I understand water injection was used in rally cars until it was banned.

The jist of it is that water is injected into the cylinder along with the gas. By injecting both at the same time they are able to lean out the gas mixture because the water has a higher latent heat of vaporization and cools the combustion process. This is what prevents engine knocking. By doing this you can run really high compression or increase the boost pressure on a turbo without getting knocking.

I think that's basically the gist of it. Has anyone else ever heard of this?

I've actually seen a car that had a water injection set up in it. It was a Volvo turbo and the guy said his gas mileage was great but the water would freeze in the winter.
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