I took 32 Mj/l from Wikipedia. It corresponds to ethanol at 21 Mj/l, or approx 66% of petrol, which is the proportion given pretty much everywhere.
I don't think a few % matter anyway. The EU doesn't have the spare capacity to produce enough ethanol. (See my soon-to-come comment below). (Some useful biodiesel mainly for farming and maybe public vehicle fleets is possible). So I agree with your conclusion.
I don't think, btw, that it is useful or necessary to show our reckonings in a submission to the Consultation. We need to thresh things out enough to be sure of what we think, and that we have a solid basis.
From the link I found on energy density:
The numbers compiled here varied a bit - the definition of gasoline and diesel is not precise; Gasoline and diesel fuel are a mixture of about 100 different molecules who's ratios vary from batch to batch. Diesel fuel should be very similar to gasoline.
