* Conversion: We need to convert one of the measurements to match the other. Let's convert liters to gallons. There are approximately 3.785 liters in 1 gallon.

* Calculation: 25 liters / 3.785 liters/gallon ≈ 6.6 gallons

* Comparison: 6.6 gallons is greater than 6 gallons.

Therefore, 25 liters is more than 6 gallons.