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 kilo gallons are in a gallon? 4000 * * * * * Although a kilo gallon is not a widely recognised unit, the prefix kilo means 1000. So a kilo gallon would be 1000 gallons.