How many gallons of gas do you need for a car?
How many gallons of gas do you need for a car? The average gas tank size for cars is 12 gallons, according to Quicken Loans. Larger cars hold up to 16 gallons, and the smallest tanks are around 9 gallons. Specific fuel-tank sizes are often listed in owner's manuals and maufacturer websites. Do you need to enter number of miles to calculate gas? For a successful calculation you need to enter at least the number of miles to travel on your trip as well as the mpg of you car or vehicle. If you also enter the gas price you...