Oh, btw I don't think any amt of caps will give you "more runtime" either; it won't be too noticeable. To run longer:-
1) gear down
2) use less-hot motors
2a) motor in good condition?
3) got good batteries?
3a) good charger?
4) max your ESC drive freq... higher = better
5) change your driving style, don't mash the gas.
...or
6) buy a nitro car
