Our data experts performed an identical series of activities on Google Maps and Apple Maps that included searching for several US cities, addresses and airports and zooming in and out to locate specific locations. On Google Maps, the average data loaded from the cellular network for each step was 1.3MB. Apple Maps came in at 271KB that's approximately 80% less data! On some actions, such as zooming in to see a particular intersection, Apple Maps' efficiency advantage edged close to 7X.
Even in Satellite View, Apple Maps was found to only use half as much data as Google Maps. On average, a single page load used 428KB of data; whereas, a single page load on Google Maps used 930KB of data.