The thing that is really going to drive up the cost of ownership for me is the cost of tires. With the P85+, rear tires are $800 ($400 each). After 1,000 miles of use, I'm down to almost 6/32 on the rear. If I'm lucky, I'll get 8,000 miles out of a set (I just had an alignment done which should help a little). That is $1 to go 10 miles. So with energy costs, I'm looking at $4 for 30 miles. So a 30mpg car with cheaper tires that can go 25,000 miles on a set would only cost a little more to run. I would have to add the cost of oil changes, which is minimal since I do them myself, but I wouldn't have the $600/yr annual service I have to pay on the Tesla. So, no real savings for me, but I love the driving experience so much, I wouldn't trade the MS for anything!