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Cost to fill

So I have been trying to calculate the cost to "fill" an empty "tank". Here is my math. It seems low, help me find the error... Or spread the good word!

Power per mile: 300Wh (per FAQ)
Miles per "tank": 300 miles
Power per "tank": 90 kWh = 300 * 300 / 1000
Cost per kWh: \$0.09 (in NC, varies by location)

Cost to "fill-er-up": \$8.10

"I rationalize the cost by believing that the Model S will become a collector's item. "A genuine antique, from the early days of the electric car revival, back when they used lithium ion batteries!""

I'm buying the Model S regardless of the collectible value, but I do think that there will be a substantial aftermarket value for 2012 Signatures, as well as for 2012 Model S of any stripe. A 2013 car, even though functionally identical, will have lower collectible value.

I'm not so sure about that. After all, I don't think anyone is paying extra for a used Signature edition Roadster. In fact, since it has older tech and a less luxurious interior, it's quite the opposite.

The value of historical objects is not their functionality, but their place in history. A new Honda Fit is a far better car by any functional metric than a Ford Model T, but, if you had a prime example of each, would be worth more?

Actually filling and then drawing 90 kWhrs into/from the battery will probably require 25% more than capacity - that's the typical battery
penalty.
As for adding the cost of the battery to the fuel costs, if the idea is to compare an EV with an ICE, then the extra costs of the ICE
not found in an EV should be considered, after adjustment for the cost of the electric motor and accessories, but not the batteries.
That should show a large sum due at purchase time for the ICE due to the cost of the engine, transmission, exhaust system, fuel system, some of the cooling system components not also present in the EV, etc. This will show that the battery is not an extra cost option, but replaces a lot of ICE hardware. Then one can calculate in the remaining unmatched battery costs to figure EC cost per mile. However, some have claimed that cost to be lower for the
smaller battery packs. Not really, since we are dealing with the same number of recharges in the battery's lifespan. For example, if those battery cells can be completely recharged 600 times, then a 300 mile pack is good for 300X600 = 180,000 miles, while the 160 mile pack only for 600X160=96,000 miles. What effect time versus number of recharges has on battery lifespan I don't know, but it's obvious that a larger capacity battery pack is going to last a lot longer than a smaller one and provide a lot more miles, reducing the cost per mile calculated by some here.

The same Liberals that jacked the price of hydro up to an average 21 cents a kw, also allowed net metering which can reduce you monthly hydro bill to \$6. It pays back in 10 years, if hydro doesn't go up(?).
Not to mention microfit!