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I don't know.... but asking for suggestions on what to put on your custom plates doesn't really sound like it's personalized to me. I realized now that my last four cars that I bought for myself had/have custom plates:
<-- the one over there currently on my Model 3
3MMQXX3 - 2000 BMW 323i
80RX7GS - 1980 Mazda RX7 GS
RSCAPRI - 1971 Lincoln Mercury Capri (2000 cc)
Saw TRBO AA on a Model S the other day. Lots of variations you could imagine on that theme, like AA PWRD, or AA BATT, or even BIGBATT. Can't deny that I like that last one.