Range often gets confused with combat radius. Range is more for a ferry flight (just going in one direction) whereas combat radius is how far you can go with stores and get back to base (there AND back).
Wkikipedia (a notably unreliable source, but it still gives a good example) has, for the F-105D, a ferry RANGEof 2210nm, and a combat RADIUS of 780nm.
I don't remember if WOV models the tanks there were carried inside the bomb bay, so you may need to check that (should be listed as an internal tank, and it probably is, TK's good about that). I'm sure some of the modders will chime in on this one with more detailed explanation.
In the TW series you don't need to worry about switching tanks, only about jettisoning the ones that are empty :)
If I'm doing a full mission, typically I'll take off, and once I'm in the climb, I'll clean up and take it back to MIL power. Climb as high as you can, but not excessively. I'll then go to WING LEVELER and cruise to the waypoints.
Hope this helps! :)