You still haven't provided your location so that we can discuss undercarriage and front cross member rust-out issues (or not).
One vehicle is standard, one is an automatic. Is that a deal sealer or would you drive either trans?
The 4 banger w/stick = 26-28 MPG
V-6 w/auto= 20-24 MPG
Pics would certainly help.
Maintenance reports? Inside condition? Outside paint and trim?
You're asking a lot from those of us who have little to go on.