Our calculations were:

According to Eurostat, transport fuel consumption for 2002 in the EU-25 was :
petrol, 5.2 e6 TJ ; diesel, 6.6 e6 TJ.
5.75% of these gives:
petrol, 0.3 e6 TJ ; diesel, 0.38 e6 TJ
Ethanol : 0.3 e6 TJ petrol  / 22 MJ/l = 13.6 e9 l
Biodiesel: 0.38 e6 TJ diesel / 34 MJ/l = 11.2 e9 l
If all the area (statistics, DG Agriculture) currently dedicated to potential ethanol feedstocks were used for ethanol, production could be an estimated:
·    10.5 e9 l of ethanol potential from the current EU-25 cultivated area of sugar beet (2.1 e6 ha @ 5000 l/ha)
·    19 e9 l of maize ethanol potential (from 6.5 e6 ha @ 3100 l/ha)
·     33.5 e9 l of common wheat ethanol potential (from 13.4 e6 ha @ 2500 l/ha)
·     23 e9 l of barley ethanol potential (from 23 e6 ha @ 1000 l/ha).
If only the surplus percentage (in excess of 100% self-sufficiency) of these crops were to be used, the estimates would be:
·    30% sugar beet: 10.5 e9 l x 30% = 3.15 e9 l ethanol
·    9% common wheat: 33.5 e9 l x 9% = 3 e9 l
·    13% barley: 23 e9 l x 13% = 3 e9 l
Surplus production (9 e9 l ethanol) would not suffice to cover the needed 13.6 e9 l. Only an extension of the area of ethanol feedstock crops, or a transfer of crops from animal feed to ethanol, would cover needs.

As for biodiesel, the total area of the two principal feedstocks, rapeseed and sunflower seed, would produce an estimated:

·    5 e9 l from rapeseed (4.5 e6 ha x 1100 l/ha);
·    2.2 e9 l from sunflower (2.2 e6 ha x 1000 l/ha)

Total production (7.2 e9 l) would not suffice to cover the needed 11.2 e9 l.

Yes, your point about ethanol/biodiesel aggregate is right: no doubt they say it's in the aggregate. My attempt here, however, is to do something punchy that will remain as a line of reasoning in readers' minds, so I avoided going into full detail. We could add the above calcs as a note?