stop in einn pre clear customs. cross the pond with a full belly of fuel.....don't play with the range on the cl604... she will bite you...part of the problem is you need to stay relatively low at first because of the weight
Just ran a real time flight plan with ARINC for our 605 at .77 and FL360 initially with our typical load of 2 pax, 2 kids and 200lbs bags. Burn was 17000#, flight time was 8+05. MTOW. Doesn't leave too many options. I agree with ruhroa, preclear and get some cheap gas in Shannon.
I agree with all the posts above... westbound stop in EINN (cheap gas). Another option, if the winds allow it is to stop in Gander or Stephansville (sp?) and just top off the wings. It's alot quicker than waiting for the tail and aux to fill in EINN. The winds don't always allow that option but it's one to consider.