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My '94 ALWAYS had tons of pressure released after short drives, and little or none after longer drives, usually.
The charcoal canister only releases vapors into the engine under certain circumstances. It's possible that those conditions aren't met on shorter drives with these cars, but on a longer drive, pressure is eventually released.
In the 4 years I had the car it was always like this, and the previous owner said it was like that for the 8 years he had the car (he got it at 2 years old). No problems ever with the charcoal canister or tank.
Since the pressure is sometimes released, that indicates that your charcoal canister is working properly. Maybe it is not working at it's best, but like I said, my old Corolla did just like that for many years with no problem. I wouldn't be worried.
Just change the oil, and in a few years time you'll be cursing yourself for buying that car...you'll be looking at it in the driveway saying 'why won't you die! I want a new one!'
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