which motor will give the most run time?

[lincpimp]

Without specific experience, I would say it is hard to determine what will pull less amps...

I can say that a hacker c50 L can motor will move a buggy around just fine.

I can also say that a hacker c50 L is very similar to a 1512 in terms of power produced, and runs slightly warmer. A 1512 is the correct size motor for a buggy, IMO.

Now I did find that a hacker c50 XL motors was between a 1515 and a 1521 in terms of power produced. But the L can seems to be very similar to a 1512.