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 gas does the tank in a Ford Focus hold? The Ford Focus ST edition, which is outfitted with a 2.0-liter EcoBoost engine, obtains 23 miles per gallon in the city and 32 miles per gallon on the highway, for a combined 26 miles per gallon.