The Floptilla to Alderney last summer had two jet skis accommpany it.
.... and Paul is thinking of doing it again in 2010!
If they can do it (and it must be said that they were aching a bit!) I'm sure a 5.4m rib can make it!
Top up at Yarmouth with 70l total (your tank(s) full and the rest on your boat or one of the support boats) and you'll get there without difficulty in reasonable conditions with a reserve.
We're more than happy to carry your extra fuel 'cos we hope to go again to Alderney and also to St Vaast. Dates for both to be confirmed - although if the Alderney trip is to be combined with the Cannonball Run, you may need to carry fuel for us if we're to do the 10M circuit with 16l