A123 5s or 6s runtime question

If load is kept the same (gearing), then current will increase with an increase in voltage. If you regear to get the same top speed you have now, then yes, you'll actually end up with a little extra runtime (how much, I dunno!). Think of adding another A123 cell as like adding another 150-200 watt hours (I'm assuming 3.0 volts at 60 amps? I could be off with that number, so you may be adding slightly more or slightly less energy) to your battery pack. More energy in the pack with that extra cell, so if you regear so as to reduce your current draw back to what you were drawing originally with your current setup, if not less, then you will experience a runtime gain.

Hahah theres a few different thoughts there.

So basically, if I increase voltage, there will be a corresponding increase in amperage due to resistance etc, but provided that I re-gear to keep the amps down, I could end up with a little bit of extra run time, right?

I could just bite the bullet and run 5s2p but that makes for a very heavy battery on 1 side of the Revo. I have tried 2p before and the jump in amps was negligible, I'm just trying to avoid having a phat 10 cell pack in my car lol.

What about changing motors to a higher or lower kv? Would that make a difference in run times?