It 's worth buying the recently published Seventh Edition of the RCC Pilotage Foundation "Atlantic Spain and Portugal" if you are cruising in this part of the world. Clearly illustrated and bang up-to-date.
In addition to OCC negotiated discounts it is possible to buy a "Pasaporte" which gives berthing discounts of 15% in several marinas in the area. Cost: €5. Amazing value.

Richard Lassen, aboard Oestara www.followingwind.co.uk Callsign: oestara PIN: 3624

Based on our current experience of filling up with diesel in Galicia, there are a number of places that we have found which have proved to be more convenient than most - convenience being defined as a floating pontoon as opposed to a wall. From north to south:

La Coruna
Portosin (if the yacht draws two metres or more you won 't be able to fill up either side of low water - best done on a rising tide and best to check with a marineiro before coming alongside)
San Vicente
Sanxenxo (but not before 10:00 on Sundays)
Combarro
Baiona

Throughput appeared to be good in each of the above. Given the relatively short distances in this part of the world, the above should be more than enough.