Where is the fuel tank button on the Mercedes-Benz C260L?

[ColtonDella]

There is a release switch on the interior door panel; pressing it will open the fuel tank. Below are relevant details: 1. Definition of gasoline octane rating: The gasoline octane rating represents the fuel's resistance to knocking. For example, 95-octane gasoline contains approximately 95% isooctane and about 5% heptane. 2. Anti-knock properties: Since isooctane has better anti-knock properties compared to heptane, higher octane ratings indicate superior anti-knock performance. 3. Engine considerations: Whether to use 92 or 95-octane gasoline depends on the engine's operating temperature and pressure. Generally, naturally aspirated engines require 92-octane gasoline, while turbocharged engines typically need 95-octane gasoline.