I don't disagree that torque converters allow slippage, but an unlocked, slipping torque converter is not the same as neutral. All torque converters unlock when you're off the gas pedal, AFAIK. Mine does, but if I put it in N then the tachometer drops and I coast longer.
Try it in your Seville.
I wish I had a '93 Seville. That's a nice ride.
Thanks, It is a nice ride,,, We need to figure out how to make these kind of cars more economical. I'd hate to get rid of it. Literally got it from a friend who sold it for an estate, "original owner /little old lady who passed from Alzhiemers. It had 54K when we got it. It now has about 80K
ANY WAY I am going to try driving the Seville differently Myself and see what happens. I will shift and glide.
1993 is shortly after Cadillac made them larger again. With a curb weight of nearly 4000 pounds it's heavy for city driving, but its drag coefficient of .33 is respectable. It should hypermile well, actually.