Anyone use fuel additives??

I don't use fuel additives in my 6.1. They aren't needed.

Here is a good explanation of E10 and E85 fuels and how they affect newer and older engines:

"Ethanol is used as an “oxygenate” and is added to fuel to help reduce hydrocarbon emissions that cause air pollution. It is highly refined beverage (grain) alcohol, approximately 200-proof, that can be produced from natural products such as corn, sugar cane and wheat.

New technology allows ethanol to be made from cellulose-rich feedstocks including corn stalks, grain straw, paper, pulp, wood chips, municipal waste, switchgrass and other sources. Ethanol used for fuel has been denatured or rendered unsafe to drink by the addition of a hydrocarbon (usually gasoline).

The term “ethanol-blended fuel,” or E10, refers to fuel that contains 10 percent ethanol and 90 percent gasoline. Similary, E85 refers to fuel that contains 85 percent ethanol and 15 percent gasoline. E85 is intended only for engines specially designed to accept high-ethanol content fuel blends, such as the Flexible Fuel Vehicles (FFV) made by some car companies. Not all states require gas pumps to be labeled to indicate the presence of ethanol in the fuel, so you may be currently using E10 fuel and not be aware of it. There have been efforts in Washington D.C. to introduce gas with 15 percent ethanol (E15).

E10, a fuel mixture of 10% anhydrous ethanol and 90% gasoline, sometimes called gasonol, can be used in all cars made from 2011 without the need for any modification of the engine or fuel system. It has been tested and deemed a safe and reliable fuel. However, repeated use of E10 in incompatible vehicles could damage it over time as the extra ethanol can corrode certain metal parts and cause blockages and pre-detonation. Classic car owners and those that drive older vehicles will need to continue filling up with E5.

E10 blends are typically rated as being 2 to 3 octane numbers higher than regular gasoline and are approved for use in all new U.S. automobiles, and mandated in some areas for emissions and other reasons.The E10 blend and lower ethanol content mixtures have been used in several countries, and its use has been primarily driven by the several world energy shortages that have taken place since the 1973 oil crisis.

Ethanol blended fuels (E10) are common throughout much of the United States. After the transition period from non-ethanol fuel, E10 may actually be a superior fuel, as it tends to keep low levels of water moving through the fuel system, keeping the system “dry”.

 

If you use a Top Tier gasoline, additives are not necessary.

Top Tier gasoline was developed in 2004 to go beyond the minimum standard for detergent additives to better protect increasingly sophisticated engines from carbon buildup and deposits on the intake valves which can result in a rough idle, acceleration hesitation, knocking/pinging, and reduced fuel economy.

The following are Top Tier gasolines: 76, Aloha Petroleum, Amoco, ARCO, Beacon, BP, Breakaway, Break Time, Cenex, Chevron, CITGO, Conoco, Costco, CountryMark, Diamond Shamrock, Entec, Esso, Express Mart, Exxon, Fast Fuel, HFN, Hele, Holiday, Kwik Star, Irving, Kirkland Signature, Kwik Star, Kwik Trip, Marathon, Metro Petro, MFA, Mobil, Ohana Fuels, Phillips 66, PUMA, QT, Quik Trip, Road Ranger, Shamrock, Shell, Sinclair, Sunoco, SuperAmerica, SuperFuels, Texaco, Valero, Value America, Wow, and Win Win.

For more information, see:

Top Tier Gasoline | Dodge Challenger Forum