Today I've attached my android on my e-revo with an application called SpeedView, I will show you my moving time's/speed, with one pack of batteries, I think will be a great value for someone, fell free to post you result's and comment.
2*3S Lipo 1,4a in parallel
ESC Castle Sv2 Sidewinder
Brushless velineon 380 Motor
2S Lipo 2,2a
Total Distance: 4,73km - 2,93mph
Moving Time(no stop's): 18m,44s
Moving average 15km/h - 9,3mph
Max speed: 76km/h - 47,2 mph
Notes: My tires are done, still waiting for a new ones Dirt hawgs
Because my tires the wheels spin a lot, this was mostely on tarmac with some soil.
Feel free to leave your comment.