How exactly are people getting long run-times?

[Snipin_Willy]

Wow, 6s 6100 in a buggy, and ~20 min? I have a 5s 5200 in a truggy and I'm easily getting 20 and I know I get 30 min bashing. How freely does the buggy roll with and without the motor pinion engaged?
I saw someone at a track with his pinion way tight against his spur and he was complaining about punch and speed. It could have been his batteries, but the tight mesh certainly wasn't helping.