Below is the recommended Google Analytics loader

    <!-- Google Analytics -->
    <script>
    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;    i[r]=i[r]||function(){
    (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new     Date();a=s.createElement(o),
    m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;        m.parentNode.insertBefore(a,m)
    })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
    
    ga('create', 'UA-XXXXX-Y', 'auto');
    ga('send', 'pageview');
    </script>
    <!-- End Google Analytics -->

That's 455 bytes, even if you have an adblocker and don't load the external javascript. No amount of removing html, head, and body tags will overcome this.