Rustler should be roughly 30 give or take gearing, motor life, incline, wind, all that science sxxt they tesch in school.
Nitro rusty should be the same 38 mph of the nitro sport with a .15.
I had the xl5 stampede while my buddy had a nitro sport. Its a close race with a vxl 6 or 7 cell NiMH.