According to an EPA press release, "Lead has been blended with gasoline, primarily to boost octane levels, since the early 1920s. EPA began working to reduce lead emissions soon after its inception, issuing the first reduction standards in 1973, which called for a gradual phasedown of lead to one tenth of a gram per gallon by 1986. The average lead content in gasoline in 1973 was 2-3 grams per gallon or about 200,000 tons of lead a year. In 1975, passenger cars and light trucks were manufactured with a more elaborate emission control system which included a catalytic converter that required lead-free fuel. In 1995 leaded fuel accounted for only 0.6 percent of total gasoline sales and less than 2,000 tons of lead per year. Effective January 1, 1996, the Clean Air Act banned the sale of the small amount of leaded fuel that was still available in some parts of the country for use in on-road vehicles. EPA said fuel containing lead may continue to be sold for off-road uses, including aircraft, racing cars, farm equipment, and marine engines."
Reference: EPA press release
Swift has this solution.
Unlike the current process of refining crude oil to arrive at a final fuel, we synthetically create hydrocarbons from bio-mass. This creation method is superior to the existing refining method because we maintain control over the entire process giving us the flexibility to meet or exceed current ASTM specifications.
The advantages of SwiftFuel are:
Seamless replacement of 100LL (no engine modifications)
15% increase in range over 100LL (no oxygenates)
20% drop in pollutants over the current 100LL fuel
15% more volumetric energy than 100LL
No need for stabilizers or additives