Revo BL Conversion questions

[Sammus]

At the same voltage (ie rpm), what would be the difference in having an 8XL and a 9XL geared for the same speed? would the 8 turn heat up more or something? this whole concept confuses me, I understand what BrianG said before, but what if the voltage is equal and you just change the gearing to make the speed of the truck the same.. surely the current draw would be the same and motors and electronics would heat up just as much?