So is there a way to demonstrate that Opera cuts bandwidth or are we to take this on faith?

I just saved the following page, [http://www.express.co.uk/celebrity-news/691536/Prince-snatched-up-Purple-Rain-house-for-117-000-eight-months-before-his-death] with both Opera turbo setting and Firefox.

Size:

Opera turbo: 6,497,528 bytes

Firefox: 5,369,036 bytes

What gives? I was hoping Opera would help me stay under my Hughesnet download cap.