Agree. 56x250 can be used as 28x500 with salvo 2 so it gives u a bit more damage than 20x500. not more efficient than dropping one row at the time but u need fewer passes to do the damage.
I settled down for the salvo 1, one row per pass method. Statistically speaking, the increased number of city block being killed was more than offsetting the increased risk of losing a bomber by puffy ack.
Have tested on compello map and 20x500 and 75% fuel is enough to go from A1 far up north to the city and AAA of the southern country and still make it back (33-35K alt) so 100% fuel is most likely too much for almost any run.
In my opinion, there ain't even a reason to waste much fuel to climb to such excessive altitudes in a B-29. I generally went to 30k only when bombing cities next to a Me 163 base, when attacking cities outside Me 163 coverage (large maps) I tended to fly at around 25-28k. (In 2013, the last full year with central strats, my average bombing altitude was 27.1k) The B-29 is fast and well armed, most of the time there's no reason to fly in "offline mode" (above 30k)
