[BrianG]

That's about right. You could increase it a little by being a little more gentle on the throttle when taking off or accelerating, but what's the fun in that? :) Or, you could reduce the weight. Your mini-lst is much lighter so it takes less energy to push it. Think of it this way, both a Honda Civic and a school bus can get to ~70mph, but which one is gonna require more power and energy to do so?

Really, you just need batteries with more capacity (mAh). If it takes X amount of power to push a vehicle the way you want, it will still take this power no matter what system you put in it. You could get some 8Ah lipos and almost triple the runtime with the same or less weight.