One more note: since James pointed in his blog to the RFCs, I reread it. 
I think now that my expectation that the source IP address value should 
influence the choice of next-hop router is related to this clause of RFC1122:

> 3.3.1 Routing Outbound Datagrams
> The IP layer chooses the correct next hop for each datagram it sends. 
> If the destination is on a connected network, the datagram is sent directly 
> to the destination host; otherwise, it has to be routed to a gateway on a 
> connected network. 

It was my subconscious understanding that while the system is solving the task 
of sending a routed packet to a gateway (choosing the gateway in particular), 
it is working in the sandbox of the "connected network" (as the system and 
gateway are in the same subnet).

I guess I was wrong ;)
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