Ok I can see we are sorta' talking about two different things, and that this argument has been done before like a dozen times. I agree by using a smaller pinion with 2x voltage you will increase the *available* torque, even though you might keep the wheel speed constant, and therefore still have more power potential.... But I was really not talking about drag caused by the larger pinion and all that. All I was trying to point out was... well I don't even remember now. I think what I was trying to say was to get better runtimes and keep the TRUCK speed the same you can gear down if switching to higher voltage. Yes if you put a higher load on the motor setup that way, the amp draw will go up there somewhere again, and that's how you will get more power potential with higher voltage than before, but keeping everything else the same i.e. weight of the truck and all other factors, yes you will get better acceleration simply due to the fact you use a smaller pinion = more torque, and yes of course the motor RPM will be faster with higher volts even though the wheel RPM will be the same with a smaller pinion if that's what we're going for. But because the average amp draw will be less with this setup because of the motor not need to turn a larger pinion (because the leverage of the smaller pinion is "easier to turn" ) chances are you won't be using up the extra power that much other than gunning the throttle a lot, so you will get better runtimes....