The classic way to convey the error that exists in a measurement is a formula that shows the obtained measurement (X) as a sum of a true score plus some error. One version of this formula is: X = T + e. With this formula in mind, obtaining more precise measures depends on reducing error.
  Mega is the prefix meaning one million, therefore there are one million (1,000,000) gallons in a mega gallon.
How many gallons of gasoline are used in the us in one year? About 142.5 billion gallons of Gasoline are used each year in the United States. This is based on an estimated figure of 9.12 million barrels per day, 43 gallons per barrel, â¦ 365 days in a year.