Efficiency?

[brijar]

I meant that they are similar in that they are both 4wd monster trucks and weigh about the same. We are both using Castle motors and running the same voltage as well. It seems to me like a Revo and an E-Maxx should theoretically require similar amounts of power, unlike, say, a Revo and a Rustler.
He doesn't flip a whole lot. Forgot to mention that he is using Monster GT tires (really tall) and I usually use stock Traxxas Talons. He also likes to drive in 1st gear most of the time, so that could make a big difference. I'm unsure of his gearing. I know he is using a Savage X spur gear (47 or 49t) and either a 21t or a 25t pinion.
I was thinking about just switching packs. My Revo breaks nearly every time someone else drives it haha. I have run a 21t pinion, but my runtime seemed about the same and was still shorter than his. What is a typical gearing people run on a converted Revo?