FWIW - I would never pay an increased price to reserve an electric car. In the past ~6 months, every Avis I've been has electric cars and they gladly give them away when asked and even seem perplexed most times I ask for them. For example, last week, I was at a large Avis location and was preassigned to a relatively basic 300. I asked for the Mercedes electric car that has ~30 miles on it (only other electrics on their lot were the Hyundai & Kias). The employee was shocked that I'd want anything to do with it and happily changed the car to the MB.