According to the
U.S. Department of Energy the average American uses 500 gallons of gas per year. We all know that there are currently very close to exactly 300,000,000 Americans.
That is 150,000,000,000. In other words 150 billion gallons of gas. 1 billion doesn't seem that big of a deal (when in addition to the extra 24 pounds so many people are driving 1,000 pounds more vehicle than they need).
On an individual level that would be using 500 gallons instead of 496.6.