Good question. I have 180 recorded runs (eagletree datalogger) of my truggy but all of them are hard to compare with each other as i'm not driving on a racetrack. When pushing the truggy hard with the Neu 1512 runtime was between 6.5-8.5 minutes. This is about the timeframe i get with the Neu 1515. i can not see a noticeable difference.