My expectation is that, if we look at a longer sales period, we should see a peak in sales right before credits end and a valley right after. If I had been in the market for an EV in Georgia as the end of the credit approached, I would have bought sooner so I could still get the credit. I expect most people would do the same. Looking at sales from the months before the credit ends and the months after tells us nothing. What we want to know is how long it takes sales to recover at the new higher price point.
Unfortunately, when I search for EV sales data for Georgia, all that comes up are articles lamenting the valley in the first months after credits ended. What I'd like to find are sales figures from at least 6 months before and after the credit.