...sailing from Bay of Biscay ~5deg W to ~70deg W is about 3900 sea miles T=D/S.
Doing 8 knots will take you a little over 20 days...have plenty of books in the Cap'n's cabin.
According to
http://www.eere.energy.gov/vehiclesa..._fotw364.shtml
fuel was only $0.18 per gallon back in 1940.
g/l