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I got this info yesterday, thought it was interesting enough to share.

Info - Top Tier Detergent Gasoline 2005 and Prior All General Motors Passenger Cars and Trucks (U.S. Only)

2005 and All Prior Saturn Vehicles

2003-2005 HUMMER H2

This bulletin is being revised to include additional gasoline brands that currently meet the Top Tier Detergent Gasoline Standards and add Saturn to the Models section.

A new class of gasoline, called Top Tier Detergent Gasoline, is appearing at retail stations of some fuel marketers. This gasoline meets detergency standards developed by four automotive companies. A description of the concept and benefits of Top Tier is provided in the following question and answer section.


Gasoline Brands That Currently Meet Top Tier Detergent Gasoline Standards
As of December 8, 2004, the following gasoline brands meet the Top Tier Detergent Gasoline Standards:

• Chevron Chevron has markets in 29 states in the West, Southwest and South, as well as in Alaska and Hawaii. ALL grades of Chevron with Techron gasoline meet Top Tier Detergent Gasoline Standards.

• QuikTrip (not to be confused with Kwik Trip) QuikTrip operates convenience stores and travel centers in a number of metropolitan areas:

• Tulsa, OK

• Springfield, MO

• Kansas City, MO and Kansas City, KS

• Wichita, KS

• Des Moines, IA

• Omaha, NE

• St. Louis, MO and St. Louis, IL

• Atlanta, GA

• Dallas-Ft. Worth, TX

• Phoenix, AZ

• Bartlesville, OK

• Miami, OK

• Vinita, OK

• Columbia, MO

• Conoco has over 4,000 stations located in 33 states.

• Phillips 66 has locations in 32 states across the nation.

• 76 has over 2,700 stations located throughout the country.

• Shell Shell Oil Products has a network of nearly 7,000 branded gasoline stations in the Western United States. Shell Oil Company markets branded products through more than 10,000 stations in the Eastern and Southern United States.

• Entec Stations offer gasoline through stations located in the greater Montgomery, Alabama area.


What is Top Tier Detergent Gasoline?
Top Tier Detergent Gasoline is a new class of gasoline with enhanced detergency. It meets new, voluntary deposit control standards developed by four automotive companies that exceed the detergent requirements imposed by the EPA.


Where Can Top Tier Detergent Gasoline Be Purchased?
The Top Tier program began on May 3, 2004. Some fuel marketers have already joined and have introduced Top Tier Detergent Gasoline. This is a voluntary program and not all fuel marketers will offer this product. Once fuel marketers make public announcements, they will appear on a list of brands that meet the Top Tier standards.


Who developed Top Tier Detergent Gasoline standards?
Top Tier Detergent Gasoline standards were developed by four automotive companies: BMW, General Motors, Honda and Toyota.


Why was Top Tier Detergent Gasoline developed?
Top Tier Detergent Gasoline was developed to increase the level of detergent additive in gasoline. The EPA requires that all gasoline sold in the U.S. contain a detergent additive. However, the requirement is minimal and in many cases, is not sufficient to keep engines clean. In order to meet Top Tier Detergent Gasoline standards, a higher level of detergent is needed than what is required by the EPA. Also, Top Tier was developed to give fuel marketers the opportunity to differentiate their product.


Why did the four automotive companies join together to develop Top Tier?
All four corporations recognized the benefits to both the vehicle and the consumer. Also, joining together emphasized that low detergency is an issue of concern to several automotive companies.


What are the benefits of Top Tier Detergent Gasoline?
Top Tier Detergent Gasoline will help keep engines cleaner than gasoline containing the "Lowest Additive Concentration" set by the EPA. Clean engines help provide optimal fuel economy and performance and reduced emissions. Also, use of Top Tier Detergent Gasoline will help reduce deposit related concerns.


Who should use Top Tier Detergent Gasoline?
All vehicles will benefit from using Top Tier Detergent Gasoline over gasoline containing the "Lowest Additive Concentration" set by the EPA. Those vehicles that have experienced deposit related concerns may especially benefit from use of Top Tier Detergent Gasoline.
 

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Interesting that BP-Mobil and Sunoco are not noted...

This is what the gasoline rep I talked to told me about: supposedly most higher octane fuels increase detergents in the formulation above the minumum required EPA standard, along with a dose of ethanol, so using higher octane fuels should help in a couple of ways:

1) higher detergency
2) if used every third tank, supposed to increase knock resistance for the engine (because of the detergent helping to keep the combustion chamber and valves cleaner, less sites for knock to start from residual hot particles from the last combustion cycle)
3) ethanol should help in water absorbtion

I'm kinda a pragmatic guy - so when I did enough experimentation to convince myself, I went ahead and used premium fuels in all my cars (yes, even the Cavalier!!!). It seemed to work out to be almost a wash in cost - about $900-$1000 a year in gas at premium, and applying mileage loss with my experiments with lower octane it worked out to be $825-$950 a year. I figure I've thrown away the $50 extra bucks in one movie night out with my wife - and supposedly have extra detergency for my fuel.

Bottom line, it seemed to be a good thing to run premium, and the extra cost seemed to be worth it - to me, I guess it still does. And in my Solstice, I'm sure that if they recommend it, then there will be differences in performance - now I'll just have to figure out which fuels have extra detergency.
 

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I wonder how that would compare with pouring a can of cheap gas additive(99 cents to $1.99) in your tank every third tank full. Wondering how the benefits to the engine would compare 'cuz the cost would be between a quarter and half as much. Around here a 20 gallon tank of premium is about $4 more than regular.
 

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solsticeman said:
Interesting that BP-Mobil and Sunoco are not noted...

This is what the gasoline rep I talked to told me about: supposedly most higher octane fuels increase detergents in the formulation above the minumum required EPA standard, along with a dose of ethanol, so using higher octane fuels should help in a couple of ways:

1) higher detergency
2) if used every third tank, supposed to increase knock resistance for the engine (because of the detergent helping to keep the combustion chamber and valves cleaner, less sites for knock to start from residual hot particles from the last combustion cycle)
3) ethanol should help in water absorbtion

I'm kinda a pragmatic guy - so when I did enough experimentation to convince myself, I went ahead and used premium fuels in all my cars (yes, even the Cavalier!!!). It seemed to work out to be almost a wash in cost - about $900-$1000 a year in gas at premium, and applying mileage loss with my experiments with lower octane it worked out to be $825-$950 a year. I figure I've thrown away the $50 extra bucks in one movie night out with my wife - and supposedly have extra detergency for my fuel.

Bottom line, it seemed to be a good thing to run premium, and the extra cost seemed to be worth it - to me, I guess it still does. And in my Solstice, I'm sure that if they recommend it, then there will be differences in performance - now I'll just have to figure out which fuels have extra detergency.
I’m curious if you tried this experiment with any of your Fieros. A number of years ago my local Pontiac dealer mechanic recommended I try running some premium in the car for a while to clean out the fuel system and engine a little. It was running a little rough, and there was really nothing else wrong with it.

So I tried it and stuck to if for a few months. Long enough to really let it do some work. However, I saw no increase in mileage or performance. No loss of performance or mileage either, but no gain.

Maybe its computer is just too low tech to take advantage of the better fuel for increasing mileage or performance. You would need a modern engine that could advance or retard the timing based on the fuel being used to really see a benefits.

Or, maybe its just my Fiero! :smile At least its cleaner inside because of it.
 

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My Cav was the vehicle I pumped the most miles on - so that's the one I did it on. I also know there was pretty sophisticated knock management on the Q-4, so it was the logical choice.

I did not do it on the Fiero for the converse of the reasons stated above. Only put a few miles on them/it, my primary one being the boat-anchor tech-4, the other being driven hard as a race fiero with the tanker-anchor 2.8L V-6. I figured neither of these was of a sophisticated level (since I actually got to rotate the distributor on the V-6 to advance the timing...)
 
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