Not every sales man works on a Saturday either.....The car is owned by a salesman that works there.

Well I did check back twice with a 45 minute span between visits. . .

Just got off the phone with Heintz. . . The highest mileage Bonneville is an '02 with 58,000 miles.

Probably thought you were asking about one that they were selling. I'll stop in on tuesday and do some sniffin around.

When I was in the Boy Scouts, our troop treasurer was a national sales rep. He owned an late 80s Grand Am named "Old Blue" that had well over 800,000 miles when it coughed up a connecting rod in his front yard. Gave it full honors, paid to have it crushed out-of-pocket.
As far as I know, not one major repair during it'* long, hard life.