hi larry, imo the computer-controlled convoy thing has always been a bit iffy, especially if you're playing the Japan side. if i were to use it, i'd slide into it slowly - allow 2 ports (and ships based there) to interact, and build up from there, once you're satisfied that the thing is working.
i've had much better luck w/ the CS convoys option for TransportTFs. i use CS TranTFs exclusively to run supplies from UK & EC-USA to Cape Town. i also use CS TankerTFs to run fuel from Abadan to Karachi, these guys work fine, but i don't have them spaced out correctly (they tend to overload either port's abiltiy to load/unload, 'cos they arrive too close together).
CS convoys also work well for me, for return-cargo. i've got AmphTFs sending supplies to Rangoon from Calcutta, returning w/ resources. similarly i've got TranTFs moving supplies from Perth to Port Hedland, returning w/ resources. the key is to use small TFs and space them out, so they arrive sequentially and don't overload a port's docking or load/unload capacity.
note wrt to off-map TF movement - while they might report as low on fuel, they prob'ly won't run out. nor will their ships incur the normal wear'n'tear damage points. off-map ships get 'magic' fuel from unspecified 'en-route' sources, i've never had an off-map TF suffer from lack of fuel, despite warning notices of low fuel reported in tracker.
< Message edited by jmalter -- 3/25/2012 4:19:12 AM >