I was trying to return my rental car this morning at PDX and, since I drove in mostly on the freeways, did not pass a single gas station. There is not one gas station on Airport Drive so, trying to save a few dollars on refueling charges, I used Neverlost to look for nearby gas stations. It took me 6 miles away from the airport to a station that was closed so, after wasting 30 minutes I went back to the airport and paid for the refueling.
Be aware and gas up before you leave where ever you are staying.
Bob