I don't get on here much as my Scion gets 33 MPG almost no matter how I drive.
I am sick of driving it, too much like a tin can, square one.
I dream of a big quiet comfortable car like yours. In fact I had one and I swear the window sticker claimed 28 MPG? freeway of course. I never really drove it as I bought it for the engine/trans, and ended up using an Explorer engine trans for my project.
Anyway good luck - more power to you!