I had turned off all the apps I could by going to the start screen, right clicking the apps and clicking "Turn Live Tile Off".
We were still using over 5 GB per month each while in the past with we had used less than 2 GB or so each per month (two laptops). I could not find out what was causing the much higher data usage.
We were grandfathered with an unlimited data 3G Verizon data plan so it didn't cost anymore but I was concerned about switching to 4G and losing the unlimited data plan.
Since we stopped full timing and snow birding, settled down in a house we bought in CO and will be selling the rig, we had the option of dropping the Verizon data plan and going with a cable internet connection which we did. Unlimited data at 30 Mbps for $39 per month.