Your local gas station probably offers you 3 levels of gasoline, like gold, silver and bronze. These typically have different levels of octane in them and you will generally get a little better mileage for the more expensive type.
In addition to different octane levels there are many different additives that can be in a companies brand of gasoline and this differentiation can have a big impact on your vehicle.
One type of additive is a detergent which generally cleans your engine. Without some level of detergents engine deposits form and this causes reduced fuel efficiency, acceleration and power as well as increasing emissions and rough idling.
Gasoline Detergent Improves Engine Performance In 1994 four auto manufacturers (BMW, General Motors, Honda, and Toyota) recognized the gasoline marketers were not putting enough detergents in their gasoline. They also recognized the U.S. EPA was not mandating a high enough minimum standard of detergents. In fact, after the EPA set a minimum standard gasoline producers reduced the amount of detergents in their gas because the standard was so low.
As a result vehicle owners were stuck with reduced engine power, reduced fuel efficiency,
rough idle, decreased acceleration and increased emissions.
These four automakers decided to do something about this problem and create their own class of gasoline called 'Top Tier Detergent Gasoline', containing a higher level of detergents. This was meant to keep vehicle owners happier with better engine performance and wear and allow gasoline marketers the opportunity to distinguish their product from the competition.
In 1994 a few gasoline distributors adopted this new industry standard and since then it has expanded across North America. Current retailers are QuikTrip, Chevron, Conoco, Phillips, 76, Shell, Entec Stations, MFA Oil Company, Kwik Trip/Kwik Star, The Somerset Refinery, Chevron-Canada, Aloha Petroleum, Tri-Par Oil Company, Shell-Canada, Texaco, Petro-Canada and Sunoco-Canada.
I personally discovered this gas by trying the 'silver' gas out at Shell. I thought it would just increase performance for this one fillup due to the higher octane. Surprisingly, later fillups with the cheaper bronze gasoline still saw a 5% increase in mileage, not bad for an aging 5 year old car.
This gasoline is good for new cars as it keeps the engine running optimally and especially good for older cars with engine deposits.
