Watching carefully, that is what seems to be happening. Everything is downloaded and then Reader strips the page down so no savings there. The satellite provider (ViaSat) offers a web browser based on Chrome that it claims to be faster and more secure but does not claim to save on bandwidth. hhttps://browser.viasat.com/faq
I can remember using a text based browser called Lynx back in the early days when the best I could do was use a 300 baud modem so perhaps I should take a look at text based web browsers. Yes, eschewing images would yield a great savings but the vast amounts of Javascript in today's web sites is a more difficult problem. Without all that code, some pages will be dysfunctional.
Next, I need to learn how to remove Outlook protection that checks web links before loading them despite the fact that I no longer have Outlook installed nor any other Microsoft Office apps. It is a vestigial tail that I would like to get rid of in the name of bandwidth conservation.