Avgas (aviation gasoline) is an aviation fuel used to power spark-ignited piston-engine aircraft. It can be distinguished from mogas (motor gasoline), which is the everyday petroleum spirit used in cars. Avgas is formulated for stability, safety, and predictable performance under a wide range of environments, and is typically used in aircraft that use reciprocating or Wankel engines. Dyes for the fuel are required in some countries:
| Country | Fuel | Lead content | Status | Dye |
|---|---|---|---|---|
| Worldwide | 80/87 | Low lead | Phased out, difficult to obtain | red |
| Worldwide | 82UL | Unleaded | Not produced since 2008 | purple |
| Worldwide | 100LL | Low lead | Most commonly used aviation fuel | blue |
| Worldwide | 100/130 | 4 grams of lead per US gallon (1.1 g/l) | In process of being replaced by 100LL | green |
| Worldwide | 91/96 | Discontinued (sometimes produced for races) | brown | |
| Worldwide | 115/145 | Discontinued (mainly military use) | purple |
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