Saving to a pdf in Google docs is twice the size of a word file and larger than Word saving to a PDF

Has anyone used Google docs to save to a word file and also to a pdf? Without changing anything between the two the PDF is 180kb and the word doc is 90kb. Isn’t the advantage of a PDF that it compresses unnecessary information? When I compress the same file from the 90kb word file in Microsoft Word 2011 to a PDF on a Mac I get 150kb. What is the other 30k doing in that PDF file? Has anyone else noticed that Google docs makes chunky PDF’s?