The weirdest car I had that really hid the gas fill was a 69 Renault 10. It was in the rear inside the engine compartment. The battery though was up front in the trunk. Very cheap car. Very expensive to keep running afer 30K miles.
I was working for a tow company years ago when I heard the story about a guy with a 55 Chrysler 300 that had a dead battery. when the tow truck showed up he suggested push starting the car. The driver said OK but you'll have to get up to about 25 or 30 before that works. He gets into the car and looks in the mirror to see the tow truck backing off a half mile so that he would be up to 30mph when he started to "push" the car