the other reason for i believe that automatic cars are more likely to cause accidents is as its very easy to get a automatic license the drivers with less experience have to deal with expert drivers on the road which make them nervous and then accidents happen. where as the manual license is difficult to get and takes longer time so the driver has enough experience onroad.
how much of a good idea is it to have addition fuel tank? i have heard that its a real life saver as i keep traveling to and from Oman so before i do even think about it was looking for a second opinion.