CFLib.org – Common Function Library Project

Description:
Calculate the Miles Per Gallon (MPG) for your vehicle. Defaults set to UK values.

Return Values:
Returns a number.

Example:

<cfoutput>
    Your MPG is #mpgcalc(4995,5235,25)#
</cfoutput>

Parameters:

Full UDF Source:

/**
 * Calculate a vehicles Miles Per Gallon (MPG)
 * 
 * @param journeyStart      Miles on odometer at start. (Required)
 * @param journeyEnd      Miles on odometer at end. (Required)
 * @param liters      Liters of gas consumed. (Required)
 * @return Returns a number. 
 * @author Dave Hill (write2dave@gmx.co.uk) 
 * @version 1, October 8, 2010 
 */
function mpgcalc(journeyStart,journeyEnd,litres) {
    var litresInGallon = 4.54;
    
    var miles = journeyEnd - journeyStart;
    var gallons = litres/litresInGallon;
    var mpg = miles/gallons;
    return decimalFormat(mpg);
    
}