I did two hours starting at midnight Saturday and used 25% of the battery. With the heating and lights anall running fuel economy was down (25%) to 3 kilos per 1% of charge. Of course being on rate 3 kept the % of takings figure low. Using my domestic supply (as I did) to recharge the cost for 25% based on last month's weighted average cost per % would equate to c.€3.62. With a takings figure of €137 that works out at c.2.6%. If one were to take the Ionity (full subscription) rate of 46c/KWh (30c/% of charge) the figure would be close enough to double that at €7.50 or 5.5%.
Obviously, even the Ionity figure (which is ignoring the €120/year sub) compares favourably to diesel but extrapolating those numbers would suggest that even if you kicked off with your battery charged to 100% you'd likely have to recharge to do anything over 8 hours of a cold Saturday night. However, those were obviously the busiest two hours of any potential longer shift and I was working outside of the city so I guess just pottering around the city with some hours being quieter more often than not you probably would get out kicking off with a fully charged battery?
Of course, the irony of it all is that they're only cheaper to run because there's no duty on the fuel - the fuel that is generated through burning fossil fuels. In reality when you take into account power factor and conversion losses at various points of the convoluted process and the weight of the battery these EVs require at least twice the amount of fossil fuels to be burnt as would be the case for a vehicle that directly burns it's fossil fuel supply and they would cost at least twice as much to run as a vehicle directly powered by fossil fuel if the electricity was subject to the same rate of Government duty as applies to vehicles that directly burn fossil fuel.