Is 1 gallon more or less than 4 liters?

One gallon is equivalent to approximately 3.785 liters. Therefore, 1 gallon is less than 4 liters. This conversion is based on the fact that 1 gallon is equal to 128 fluid ounces, and 1 fluid ounce is approximately 29.5735 milliliters, which translates to 0.0295735 liters.