Do you mean 1024 GB? 1024 MB is about 1 gigabyte. Even the stingiest of mobile internet providers are happy to cap you at well over that. To answer your question, unless your wifi connection is seriously error-prone, you will not see any difference. The only way to use less data is to actively try to use less data. Streaming on a Roku? Go into the options and drop the quality to medium. Downloading large files? Do less of that. Things that use a lot of data:
Streaming video (youtube, netflix, hulu, etc), downloading large files (including via bittorrent, one way piracy can bite you in the butt), downloading large games or other software (Use Steam? Those downloads add up quickly), downloading entire galleries worth of high-quality art
Things that use less data:
Streaming music, simple web browsing, playing games on facebook, playing online games in general (this can vary)