This is correct to use KWh. A Watt is just a rate, which is Joules/second, and the Wattage used by your vehicle varies moment to moment depending upon your acceleration, velocity, wind drag, elevation change, etc. You can find the average Wattage used by your vehicle during your trip, and just multiply it by the appropriate time unit that it took to travel the distance to find the total amount of energy used. Ex- (Joules/second)*seconds of travel = Total Joules (energy) used during travel. 1 KWh = 3,600,000 Joules Time and distance are always related, so your method works as well. |