What is the volume of 1 US gallon in liters?

The volume of 1 US gallon is correctly identified as 3.785 liters. This conversion factor is established based on the metric system where 1 US gallon is defined to be equivalent to 3.78541 liters. For practical purposes, it is often rounded to 3.785 liters. This conversion is important in aviation and many other fields where fuel capacity and consumption need to be accurately calculated across different measurement systems.

Other choices reflect incorrect conversions for a US gallon. For example, 4.545 liters is often associated with the UK gallon, which is larger than the US gallon. The smaller values of 1.2 liters and 2.54 liters do not represent any standard gallon conversion and thus are not relevant in this context. Accurate knowledge of these conversions is crucial in ensuring safety and performance within aviation operations, especially when dealing with fuel measurements.