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Short answer: Yes it will work, and you will lose power.
I know a guy who had his WRX tuned for 87. Thing is, he didn't tell the tuner before the session, just filled it up. Tuner was disappointed with the power he got, and probably spent longer than normal tuning. He was noticeably upset once the guy told him why it was so low. It was a good 87 map, but I recommend informing the tuner of your fuel choice before attempting.
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