The car analogy comes from a calculation for a small single engine airplane or light sport aircraft in the $50,000 range. Using an aircraft loan calculator such as this one from AOPA, we find that you can expect to pay around $400 per month for a 20-year loan with 6.5 percent interest.
Overall, red onions contain a higher amount of antioxidant compounds. They are higher in total flavonoids than white onions and yellow onions are considered to be in the middle. Red onions contain 415 to 1917 mg of flavonols compared to yellow ones, which only contain 270 to 1187 mg.
Among those that are mild flavored are the larger, more spherical Spanish onion, which is usually yellow skinned (but can be white) and typically in season from August to May; the white or yellow Bermuda onion, available March through June; and the red or Italian onion, which is available year-round.