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@Stablebarns
HEAT!
As someone mentioned... the Aluminium (Post) has fused with the steel alloy (Frame) and they are like chemically getting it on! The Caustic soda does work. Not tried Diesel... But Heat also works. I got a steel fabricator to put their torch to the seat tube. Heat it up til it loosens! You do loose paint from the frame! I didn't care coz I was re-spraying.
But the perils of not getting it out!!!!!???? I was riding through rush hour traffic with a heavy bag on the same frame with a seized post (the first time it happened)...... It snapped at the seat collar! I fell off backwards (It was an old Kona so I was a little more rearward in my seating than your average LFGSS member!)! Basically the same chemical reaction that is causing the seizing...will eventually cause enough corrosion to snap it. BE WARNED!