TriCLEAN gasoline is an enhanced, custom-blended fuel that includes nitrogen-cleaning agents to keep vital engine parts clean for a smoother running engine.

CITGO Introduces TriCLEAN™ Gasoline with More Nitrogen Cleaning Agents.

Is Citgo gas top tier? Yes, Citgo gas is TOP TIER. TOP TIER licensed retailers agree to not use organometallic additives (like MMT or Ferrocine). To get TOP TIER license all retail locations must meet the high requirements of the TOP TIER program.

Retail gasoline stations in the United States sell three main grades of gasoline based on the octane level:

• Regular (the lowest octane fuel–generally 87)
• Midgrade (the middle range octane fuel–generally 89–90)
• Premium (the highest octane fuel–generally 91–94)

You'll know you're filling up with the good stuff if you spot a small green sticker on the pump that says “TOP TIER Detergent Gasoline.” As of early 2022, the following stations sold Top Tier gasoline in the U.S.: 76, ARCO, Aloha, Beacon, Breakaway, CITGO, Cenex, Chevron, Conoco, Costco Wholesale, CountryMark, ...

For daily driving I'd buy the Shell Nitro because it's got the better detergents. If I was heading to the track or a competition event I'd be buying the Citgo to get the performance bump. The Citgo will also give you slightly better mpg.

You'll know you're filling up with the good stuff if you spot a small green sticker on the pump that says “TOP TIER Detergent Gasoline.” As of early 2022, the following stations sold Top Tier gasoline in the U.S.: 76, ARCO, Aloha, Beacon, Breakaway, CITGO, Cenex, Chevron, Conoco, Costco Wholesale, CountryMark, ...

Regardless of whether your car calls for regular or premium, the best choice for ongoing performance and economy is a TOP TIER gasoline. Recent AAA testing found TOP TIER gasolines keep internal engine components up to 19 times cleaner than gasolines that only meet minimum EPA standards.

The octane rating on different grades of gasoline is a measurement of the fuel's stability. Higher octane numbers mean greater stability. The greater stability indicates the gasoline's resistance to preignition and the fuel's ability to resist “knocking” or “pinging” during combustion.

The higher an octane number, the more stable the fuel. Retail gasoline stations in the United States sell three main grades of gasoline based on the octane level: Regular (the lowest octane fuel–generally 87) Midgrade (the middle range octane fuel–generally 89–90)

The International Fuel Quality Center (IFQC) has ranked the top 100 countries based on sulfur limits in gasoline; Germany was found to be at the top of the ranking with the lowest sulfur limits. Following in second and third were Japan and Sweden, respectively.

TOP TIER™ Detergent Gasoline is a fuel performance standard based on Deposit Control Additives and designed to minimize carbon deposit build up on critical engine components like air intake valves and injectors. It also prohibits the use of organometallic additives known to damage catalytic converters.