Tesla has just revealed reduced lease rates for its Model S, along with a "happiness guarantee" that lets you return the EV up to three months after purchase with no penalty. Elon Musk said that buyers in certain states will get rates up to 25 percent lower, thanks to a new deal it struck with US Bank. Leasing currently starts at around $800 per month for a Model S. The return guarantee is "no questions asked," but Musk added that it's not possible to then turn around and lease a newer model unless you pay a pass-through fee. Tesla recently announced a new, more powerful "D" variant of the Model S and has the Model X SUV and cheaper Model 3 in development. The new lease rates and guarantee have led some to speculate that sales are down, but Tesla told the NYT that "demand remains extremely strong for the cars."