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.
1 Gallon [UK] = 4.54609 Liters. For liters to gallons converter, please go to liters to gallons. For other volume unit conversions, please go to Volume Conversion. For fuel economy conversions such as mpg to liters/100km etc, please go to Fuel Economy Conversion.