I've found that the GPS system employed on the device is really well optimised power wise. Using it with Pokémon GO also uses far less power than I expected.
Going from a Samsung Galaxy S6 edge to an Honor 5x, I must say one of the main advantages is the battery life. I too find myself playing Pokemon Go for so much longer. Also comes in very handy when using maps.
I've used Waze for navigation, Google Play Music, all streaming over Bluetooth in my car, and had similar usage. It was maybe 10% for 40 minutes as opposed to 50, but still similar. Very pleased with the battery performance.