If you’ve been on a cross-country trip and have been looking for the next place to get gas, Google will help you out. Google Now will show the nearest gas stations along your route. Users who saw this card pop up weren’t necessarily using Google Maps’s navigation but they were driving. It would seem Google is taking a look at how fast you’re going and predicting where you’re headed to provide you with the information. Since it’s prediction-based, you can’t expect it to be accurate, but we assume that if you use navigation, you’ll get more accurate results.
Source: Android Police | Download: Google Play Store (Free)