While Google Maps has been notorious for data consumption, the Wi-Fi only setting will be handy to save users from running out of their data plan’s limits.
Surprisingly, you might not have even noticed that the Maps application uses data, after all, it's supposed to be a GPS service, right?
Albeit, Google Maps have an offline mode (which also help save on data), the Wi-Fi only mode offers a better experience.
The roll-out of the new feature that brings the option to make Maps data primarily over Wi-Fi is still underway, you can give the feature a try by downloading version 9.32.1 of Google Maps from the Play Store or APK Mirror.
Take a peek and add your suggestions for how you’ve saved more offloading data from Wi-Fi when available.