Once while in Australia flying with a mate of mine having a good look at the interior his 172 started coughing and sputtering we were getting lower and lower to the ground. flying along a dirt highway. that the road trains used we were both pulling as hard as we could on the yolk he was pushing and pulling every knob and manual pump lever in there was I have no idea how slow we were flying if flying could even be a descriptive word at that point. when a road train passed us if we had been a few feet lower we could have hitched a ride, just about then the engine made it's last wheeze then we almost fell the last few feet to the ground and rolled to a stop.
The Truckie stopped his rig and walked back to see if we needed any assistance. Turned out to be a couple of clogged filters and bad gas was the only problem borrowed 40 liters of the driver's generator gas cleaned the filters then Flew on to the next place to get fuel