When I put my deposit on the Elio sales were fairly brisk, routinely exceeding 50 per day (averaged) and often 100 per day. After September 2014, when the 50% reservation bonus was withdrawn, the reservation rate dropped remarkably, averaging mostly between 20 and 30 per day. With the recent auto shows and the commercial, sales the past few weeks have been better, seeing reservations of over 40 per day, on average. (Note that Elio reinstated the 50% reservation bonus, but the numbers never returned to the previous sales performance.)
For the raw reservation figures I've been collecting, visit https://goo.gl/Qve0c3.