For a 2014 model Honeywell RTH2300 to Coleman Mach
As of 06-01-2014, these settings are working.
(FYI, I had another Honeywell Stat, digital, 5-2, that did not have the hg/he switch and it would not work. I might have given up to quickly, but it did not have the needed switch, so IDK)
The final working wiring is set as follows:
A/C side Stat side
White to white - Heat
Yellow to yellow - A/c comp
Green to green - fan (low or hi)
Grey to green - fan (low or hi)
Red to R/Rh (leave jumper on)
Blue not used
All other connections on the Stat are not used.
The switch on the back of the Stat should be set to "HG" (or gas heat)
Many thanks to gljurczyk and sdelam and Triguy for their excellent help!