Final answer:
To convert gallons to liters, multiply the number of gallons by the conversion factor of 3.79; for example, a 12.0-gallon gas tank is equivalent to 45.48 liters.
Step-by-step explanation:
To convert gallons to liters, you can use the known conversion factor that 1 gallon is approximately equal to 3.79 liters. The conversion process involves multiplying the number of gallons by this factor. For example, to find out how many liters are in a 12.0-gallon gas tank, you would multiply 12.0 by 3.79, which equals 45.48 liters. This step-by-step method ensures accuracy in the conversion from the customary unit (gallon) to the metric unit (liter).