SIX Oil Tankers required
HHOis4suckers ó June 03, 2009 ó Hydrogen and HHO have a very low energy density
http://www.ftc.gov/bcp/edu/pubs/consumer/autos/aut10.shtm
45,000 Gallons = 170,343 Liters of HHO
At 2 Liters per minute, it would take 1,420 Hours or 59 Days