Dwindling global market demand for gasoline containing the additive tetra-ethyl lead (TEL) and increasing global environmental issues have raised concerns regarding the continued use of avgas (100LL) by general aviation (GA) aircraft.
GA piston aircraft are reliant upon 100LL, a "specialty fuel" that is produced in small quantities when compared with other fuels. Optimistically speaking, 100LL will continue to be more expensive relative to other petroleum and energy products and, at worst, could be unavailable altogether. Currently, there is no single replacement for 100LL that is economical, requires only minor or no aircraft modification or recertification, and does not offer a penalty in aircraft performance.
AOPA is interested in the ongoing efforts by a number of different groups on possible replacements of 100LL. AOPA maintains that a high-octane unleaded avgas or other product that can satisfy the needs of the entire existing GA piston engine fleet with little or no modification and at an economic price per gallon should be developed, tested, and approved in a timely manner.
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