which motor will give the most run time?

[suicideneil]

Motors dont draw watts, they make them:

Power (watts) = voltage x current (amps).

I would say compare the listed specs of a neu and hacker that have the same kv rating and length to answer that question (on paper at least).

Since a neu has 4 poles vs 2 on the hackers, I would say you could get away with using a smaller neu to do the same amount as work as a larger hacker- due to nearly double the torque being produced. A 1509 should work okay in a buggy, but I'd say look at other peoples setups to see what they like the most...