In addition to offering an extra 20 miles of range over the P100D in the Model S (but just six miles in the Model X), forgoing the extra performance will save you $39,500 in the sedan, and $37,000 in the SUV. In fact, the 100D models are just $3,000 more than the 90D. They also share the 90D's 0-60 times of 4.2 seconds in the S, and 4.8 seconds in the X, which is plenty quick. Admit it, there was no good reason you needed to be able to do 0-60 mph in under three seconds.
Interestingly enough, the 90D is still available, but don't be surprised if Tesla soon removes it from its website just as quietly as it added the new longest-range consumer EV in the entire world. Apart from the extra 10 kWh of battery capacity, the 90D and 100D offer the same standard equipment. That includes the latest in Tesla's autonomous driving hardware, which will only make the car smarter with future software updates.
Getting an extra 41 miles of range per charge for just $3,000 more than the 90D seems like quite the bargain, and don't be surprised if it helps boost Tesla sales. It's not hard to imagine that a customer who's drawn to an electric vehicle in the first place might be more concerned about efficiency than having the fastest car on the block.