Wow, that went really fast.

Thanks for all the links, they are great!!!
So that can get me started in optimizing my car!!
One of the main reasons for getting the 1/16 erevo was its size (smaller than most), its water-and-dirt-resistant features (yes, I know, the mechanics need servicing...) and I really liked the idea of the "training mode".
I already checked out the "Common Issues" thread, this is a great thing. It should be on top of all the topics of the forum, so all the new users would see it right away!! I guess each RC-car has its flaws; until now, I am surprised at how much abuse (mostly unintentional) the erevo can take. And it is really a fast mover (with my kids I use the training mode, but when I m alone...
And I already tried out the series connector for a few minutes, but I guess this really puts some strain on the parts (shame on me, did not change to the smaller gear yet

)
My boys love to jump, but practicing that in the skater park does not really work with all that concrete around; so I built a little ramp at home where the RC can land in the grass. Still, things are going to break eventually, and I expect them to. I will change to the smaller pinion, which will increase the torque and thus the strain on the drivetrain, but with just one battery (NIMH for starters) I hope it should be ok. I prefer only one battery with the stock springs, with two they seem a little weak (and I already read that here in the forum, with one it seems ok for what I do with the car)
Thanks again for the fast and great answers!!

PS: A great thanks to UltimateRC for its videos...honest and really helpful, especially for a beginner like me!!