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KWh measurement

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Measuring the kWh consumed from the outlet is critical if you wish to determine your vehicles electric fuel consumption. This differs from devices such as an E-Meter which don't measure energy into the vehicles charger and as such don't include it's efficiency.

You can use something like a common home power meter which measures cumulative kWh consumption, this is generally best suited for a dedicated charge outlet at home though some have installed them in their vehicles for measurements away from home.

There are also a number of smaller and more portable digital kWh meters, most of which measure kWh like your home meter, but also measure Volts, Amps, Watts, VA, Power Factor, Time, and even cost. Furthermore some offer PC interfaces and internal data logging capibilities.