Which modpack are you using?
If its ultimate the minefactory harvester blocks are recommended- they shred trees at a stupid speed and work with most modded saplings
(a few of the larger trees might need a config tweak to extend the search range of the block)
Also use either oak saplings, or a modded tree type that makes apples/fruit- you make biomass more efficiently with juice than water, and the mulch byproduct can be used as a fermenting agent.
If you dont have minefactory- a forestry multifarm (orchard) for fruit, and a few cart farms for saplings should sort you.
(if you have Gregtech- run the biomass through a distillation tower, it'll turn 16 buckets of mass into 8 of fuel in about 20 seconds)
(edit- removed random formatting from derpy forums)