Does your ICE do 0-60 in ~4 seconds? ICE cars at the Roadster's performance level tend to be quite expensive to maintain. Fuel+Tires+Maintenance for a Roadster is more expensive than a Corolla, but a Corolla is no Roadster.
Here are the numbers I calculated for our Roadster versus various other vehicles, count fuel+tires+service, 12,000 miles per year, $0.12/kWh, $2.50/gal, AD07's getting 12,000 miles on the rears and 40,000 on the fronts (my experience with our Roadster and paying Tesla's price for the tires).
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I think it's unrealistic to expect that gas will average $2.50 over the long term, so here's what it looks like with $4/gal gas.
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Tires are a big part of the cost of operating a Roadster. I run Continental Extreme DWS in the winter and they cost less and reportedly last longer. They also seem to be quieter and more energy efficient. If they last 24,000 miles, and I used them year-round, my cost to drive the Roadster would drop by 5.5 cents/per mile to 14.8 cents/mile. It will be interesting to see what the Roadster 3.0 tires cost to operate.
The graphs are little unfair in that it counts major service for the ICE vehicles, but doesn't count battery replacement for the Roadster or Leaf. Assuming a new Leaf battery pack every 60,000 miles adds 9.2 cents per mile.
Which brings us to the big question: how much will the new battery pack cost? If it's $40,000 and we assume 120,000-mile replacement, that adds 33.3 cents/mile and makes the Roadster more expensive to operate than a Ferrari. If we scale the cost of the Leaf battery ($5,500 for 24 kWh) to 70 kWh, we get $16,000 and only have to add 13.3 cents/mile.
Then we get to depreciation. ICE vehicles wear out. EVs should last a really long time assuming you can replace the battery pack when needed, so the Roadster and Leaf are likely to come out winners if batteries continue to get cheaper and there aren't any other significant maintenance costs.
Plus, electric cars are more fun to drive and more convenient to fuel.