UTXO clarification

Hi all,

If your balance is made up of 10 UTXO’s making 1BTC and you send 0.7BTC to someone, does that that clean up the UTXO’s? i.e. there was 10, you’ve sent 0.7 to someone, then received 0.3 (minus fee) back as a now singular UTXO? This making the next transaction cheaper?