Auto Scaling groups with multiple instance types and purchase options

You can launch and automatically scale a fleet of On-Demand Instances and Spot Instances within a single Auto Scaling group. In addition to receiving discounts for using Spot Instances, you can use Reserved Instances or a Savings Plan to receive discounts on the regular On-Demand Instance pricing. These factors help you optimize your cost savings for EC2 instances and get the desired scale and performance for your application.