The economics of shaking after pumping are not the biggest issue…
Those who don’t take the last few drops when removing the nozzle give me a real pain.
Some cars, like mine (Mazda Miata), have horizontal gas tank openings. It is
virtually impossible to insert the nozzle without spilling the few cc’s left behind
down the side of my car. That looks like heck and doesn’t help the finish.
Please clean up after yourself.