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Msfossy,
This is a real quick, cheap, and dirty job, but I used the invisible internal tank weapon (included) and modified both the .air and.dp files for Tango Romeo's three B-26B models to include a drop tank entry. The .dp file lists this payload as "Long Range Ferry" with just the crew and tank as payloads.
I also noticed TR used the R-2600 engine data for this models rather than the R-2800, so I adjusted the engine data for them. If anything, they should be a little more powerful and better performers than they were before.
I don't know what this will do to the range, but if you know how to use AIREd, the entry for the drop tank is record 534. According to this website:
http://www.joebaugher.com/usaf_bombers/b26.html
The B-26 could have as many as four 250-gallon bomb bay tanks for ferry flights, so if you need more avgas, just bump up the number from 250 to 500, 750, or 1,000 gallons.
I don't know what that will do to handling and/or takeoff performance, so you'll have to experiment in testing. I did not test this on my rig.
Good luck and have fun!