Don't know if Canada in that post, but the darker your interior, the darker your windows will
look.
PA is 30% and it looks lite on the Alero, but 30% on the ex wife's car, gun metal grey with black interior, looked really dark, with the same % of tint

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33% ALEROMOD OWNER!!
2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
2007 Volvo V50 T5 6M 15.782 @ 89.12
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