On the minus side, the initial values in the calculator are heavily shaded towards Tesla. Who spends 15 minutes at a gas stop? Using the average cost for electricity instead of the marginal cost?
Try making the cost of gas low, and electricity high, and the "savings per month" simply drops to 0 and stays there, instead of wrapping around and becoming a cost.
Yeah it's an estimate, but it doesn't cover any of the basic possibilities.
The fact that they shaded the initial number in order to close the sale is deceiving, and honestly, surprising from a company I previously held in high esteem.
It's not that this practice is uncommon, it's that I wouldn't expect it from Tesla.
* Going from the $10k CA incentive to the $7.5k other states one changes the monthly from -80 to -11? Is the incentive sunsetting or something?
* The default settings assume you are using it for business and can deduct the cost. Just unchecking that makes it significantly more $$$.
* The gas savings assumes your gas car gets only 19 mpg and requires $5 gas.
Having a $222 business tax discount selected by default seems questionable to me though.