Answer :
Final answer:
The Cessna 172 uses Avgas as its approved fuel type, with the most common variant being 100LL, which appears as a distinct blue color.
Explanation:
The Cessna 172, a popular aircraft widely used in general aviation, uses Avgas (Aviation Gasoline) as its approved fuel type. The most common type of Avgas is 100LL, where LL stands for 'low lead'. This fuel is known for its distinct blue color. The blue color helps pilots and mechanics identify the fuel grade and avoid any potential mix-ups, contributing significantly to flight safety. However, it's worth noting that fuel colors can vary with different types of Avgas.
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