Tips on picking, entering, and leaving gas stations

Pilot, Flying J, Loves are the stations we use the most. Even then I look them up on www.googlemaps.com earth view and zoom in to see the access and exit. If someone is parked and blocking our exit, we tell the manager of the station to ask them to move before we exit. We also fill up at half a tank so we will have plenty of fuel to move on and find a roomier station.