I have come across some cans that have leaked out, yet the cans appear pristine. To make sure, just weigh them. Add a couple of ounces over the stated weight to compensate for the metal can.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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