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Charging Losses / Total Power Estimate

Charging Losses / Total Power Estimate

Am trying to figure out which electricity plan to sign up for on our Garage (it runs on a separate meter +/-). It looks like the best estimate is around 240 wh per mile on the M3 LR? How much more do we need to add for charging losses on a standard L2 charger or a NEMA 50A configuration (we have an L2 chargers so am thinking it and adding a NEMA plug for the second car). I found the estimate below that suggests around an 82% charging efficiency (e.g. ~293 wh/mi consumed electricity). Any thoughts on this?

http://www.teslarati.com/tesla-complacent-model-x/