I did this many times. When ever i used to rent a car(Santro) fill tank and drive. When time came to give it back, fill 50 rupees cng and drain all the petrol. Once i drained too much and owner had to change fuel filter Luckily he's a good friend of mine hehe
Attach a clean Gas pipe shown in picture above and I'll attach a picture as well. Start car in neutral and watch the magic happen:)
My opinion: No point. You might end up spilling some, pipe might get loose after too many tries and if you can afford keeping a car, you can afford a liter of petrol.