Looking at some brushless servo - thoughts? Longer runtime?

[Overdriven]

Assuming the 6v batteries are the same, and all endpoints are set properly I can't see why one would draw more than the other to the point its that noticeable. The only other conclusion I can come to is one of the 6v packs is weaker than the other or because the savage is heavier the steering servo is drawing more working harder to turn the wheels and the brake servo is working more often/harder to stop the truck.

A friend and I experimented once hooking up an amp meter to the steering servo in a T-Maxx. With the truck stationary we tried going lock to lock wheels on the ground and off, and noticed significantly less draw with wheels off the ground. The rate at which we sawed the wheel back and forth also affected amp draw, slower saw=less draw. We also tested the effects of bad endpoints, steering binding issues, and big tires (each tested individually) and saw amp spikes over 1amp (about twice normal readings) in each case. Another interesting find was upgrading from a TRX2055 to a 200oz JR? (i forget exact model/specs) saw a significant decrease in amp draw under normal conditions.