But how much are you NOT paying for petrol driving the Tesla over 5 years.
My cost kWh is much lower than yours, 8.3 cents, but my vampire cost is higher because my car sits unused for weeks at a time while I am at my primary residence. With ICE my costs were also higher, replacing batteries every 15 months or so, fuel evaporation consuming as much as 18 tank when left sitting for six weeks (That surprised me with sealed tanks but ti was always true). Time will tell, but the storage inefficiencies for me seem fairly similar in cost, but the S battery drain irritates me even more even though the inconvenience is much less than changing the battery of an ICE in order to drive away.I liken it to having a leaky gas tank. You pay for the fuel even if it leaks out... That's a 231 kWh difference and at my utility's off-peak rate of 12.65 cents is $29.22 in one month. (I did drive a little over 3,000 miles last month).
Maybe a "leaky gas tank" is just an artifact of EVs although it certainly seems more pronounced in my Tesla than in my company's Volt, for instance.
...but my vampire cost is higher because my car sits unused for weeks at a time while I am at my primary residence.
Hmmm. My EV equipment provider has a few dozen Tesla S's in the fleets for which they administer charging. They just might have records for power usage during continuous connection without driving. I recall their President telling me that the majority of their Tesla S clients are part-time users as am I. I'll ask.That's an important distinction. I drive my car (a lot) daily and it rarely sits more than just overnight. So mine doesn't get a chance to "leak" as much as yours where it is sitting for a long time.
A couple of years ago I watched my sub-meter attached to the car's charging circuit remotely while I was away for 2 weeks on vacation. The car would "top up" to the tune of 2.5 kWh exactly every other day. I think with more recent firmware this vampire loss is less, but I haven't watched it like this in a while.
With the car in best conservation mode, the amount of blood to feed the Vampire daily is about 1.25 kWh in older cars and down to about 1 kWh or less per day in newer cars..
912€ and 1600$ is the same order of magnitude as will be saved in gas costs over 5 years (for Belgium, Tesla says 6000€), yet Tesla does not account for it AFAIK.