I thought it was 24 cents per mile, and then $109 per diem (total, to include lodging, food, incidentals). You choose how you want to divide that per diem up--just make sure you take all days of travel and not check in early. If the per diem rate is affected by rank, that will be a shock to me. ($109 is, btw, standard CONUS per diem rate--70 bucks for lodging, plus the rest--and isn't affected by rank) I have no idea where they're getting $50 from. Definitely ask them to show you in the JFTR where it says that.What's the standard rate for mileage and per diem while on a PCS move in your car (for a new O1). The GS here told me $50/day of per diem but she didn't know the mileage rate.
Additionally, are the DITY and PCS payments are separate- meaning, does the total payment = PCS entitlement + DITY payment?
I'm pretty sure PCS moves are a totally different pot of money than PDITY/DITY moves. You'll get one check for the move (repo), and another for the hauling. At least, that's my guess. It's be a long time since I tried a DITY, although I'm doing one in a couple weeks.