Is there a big difference between few and many variables in the photonstream?

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Hello,
I have a cargame where it is possible to pick up powerups for the car. Those powerups change the stats of the car, so it may have more power, better handling or something else.
In the photonstream where all the inputs are sent, I add the stats of the car to be sent aswell, so whenever something changes, it is shared accros the network.
Is it a bad idea to send all these stats in the stream, and should I just use RPCs whenever a stat change for one of the cars in the game? The reason I like attaching the stats in the stream, is because I avoid having alot of different RPC functions in the list, and there is no risk of stats not being synced, in case an RPC gets dropped.

My question is basically this: Is there a major difference in the network usage between a stream of 5 rarely changed variables. and a stream of 20 rarely changed variables?