I've gotten 6 mixed groups up to 80 and I've found the fastest thing up until 68 is boosting. After 68 or so questing is the fastest (especially as Alliance, they have FAR fewer collection quests for some reason).
Also, you really need to change your mage to arcane (upped my mage's DPS by 35% or so - wow!) and your lock to Destro (affliction requires way too much micro-management to be competitive with destro).
The mage macro is stupid simple too - look up a thread started by "pinotnoir" here about arcane mage macros - I use the ones he came up with.
Mixed classes take a while to get set up, but that's part of the fun of it! I enjoy them MUCH more than single- or duo-class teams.
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