Aircraft accidents are rare enough that the statistics aren't really meaningful but people have studied it.
Assuming on the ground incidents, which are most likely to be survivable - as opposed to flying into mountains.
1, Front of the plane is most likely to hit something, a runway obstruction/another plane - but the pilots are there and so try and steer away from things heading toward them.
2, The wing box is the strongest part of the structure, and because the wings are in the way it is difficult to hit the mid-section with another aircraft. But as you say, there are often empty fuel tanks and hot air conditioners directly under your seat.
3, The rear of the plane occasionally suffer minor tail strike accidents on take off. But as the old saying goes - no plane ever reversed into a mountain. Passengers also tend to rush forward toward an exit - leaving the tail exists clear.
Myself and a group of engineers were once told-off by a flight attendant for discussing this while waiting for take off. This was pre-9/11 and in Europe so we weren't immediately dragged off the plane at gun point.