I recently purchased this truck after reading so many great reviews here. I purchased it from my LHS. On my 2nd battery charge, I decided to strap my small Garmin jogging GPS to it to check the 30 MPH claim on stock single Nimh battery and stock truck setup. To my disappointment, the truck only toped out to a little over 17. I verified the ECS was in Sport mode. I email support and they mention either the slipper needs tighten or the battery needed a few more cycle. I don't understand why the slipper would effect top speed. I'm getting ready to mail it back to Traxxas but decided to ask here. I search the forum and could not find anyone with similar issue. Any help would be appreciated.