Update to Google Maps adds gas prices, and allows you to navigate a detour
Another new feature allows you to make a detour in the middle of navigating from point "A" to point "B". Let's say you are navigating to a hotel when you decide to stop and pick up some supplies. Clicking on the magnifying glass in the top right corner will give you a drop down menu with gas stations, restaurants or grocery stores among the categories to choose from. In this situation, clicking on grocery stores will help you find the closest place to pick up some drinks and snacks.
If the categories listed on the drop down menu are not what you're looking for, you can always use voice control, or the search bar, to help you navigate your way from point "A" to point "B" with that little detour in the middle.
source: GoogleLatLong via AndroidCentral