What would be happened if I refill premium gas to a car using regular gas?

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In Salt Lake City, Utah, the elevation is 4000 ft. Gas station provide regular gas at 85 octane and premium at 91 octane because high elevation has lower density of air. My VW jetta use regular gas so I always refill regular 85 octane gas all the time. I am now planning to have a road trip to Las Vegas (Sea level) so I plan to refill premium to make gas tank have average octane level to around 88 (achieve minimum octane level at the sea level, which is 87).

What would be happened if I refill premium gas to a vehicle which requires using regular gas?
 
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