What is the best setup 8xl and warrior 9920

[sluggie24]

According to the Ohms laws as I understand them, voltage and current have a inverse relationship given the same load. As voltage goes up current goes down and vice versa. So if I use a certian motor and gear ratio with 14v it will draw more current then if I use 18 or 24v. But if I change the load value by changing the gear ratio causing the motor to work harder then then current draw will increase. Can anyone back this up? Lets put this issue to bed. LOL

I think if I gear it properly I can get about the same run time on 20 cells as I do on 14. I just have no idea what ratio to use.