EXCEPT... I can tell you that at one point, one of the leaders in this space only counted reviews that were less than 24 months old toward the dealership's average. You'd probably need to know the "secret sauce" for each source's score to accurately give the number required to bump the average. If you have 100 1 star reviews from the previous management that are 23 months and 23 days old you may need 0 new reviews in the next week to see your average go up. BUT... That doesn't really matter. To Joe's point, the benefits of establishing a rock-solid process for review solicitation far outweigh the benefits of an average score bump alone. To Joe's other point, I used to say often that "five words and five stars won't sell or service cars." The stars didn't matter much then and they REALLY don't matter now. Work to collect stories NOT stars and then consider taking the time to read the best stories that you collect in team meetings.