run time question

currently im running a 2650kv cc motor in my rc8. my batterys are zippy 30c 5000mah 4s. i currently get a run time of about 13-15mins on the track going hard.

if i where to switch to a 2200kv motor would i get a better run time. right now the 2650 is retarted fast on the track. it kills all the nitro guys and all the losi 8ight-e cars with the losi brushless in them. so i would not mind going a little less power if i can get more run time.


thanks!