Don't you think that if UFOs came to Earth they would have issues refueling?

Well, first thing I'd do after a trip across the galaxy would be to look for a gas station, but I'd be trying to pee before I fill up the tank.

"Sorry, we're all out of uranium...try the Home Depot."

"Why are you putting that sludge next to my fuel tank? Oh, we use that for lubricant, not fuel. We use saltwater and sunlight to make this thing move."

"Really--you don't have anything that fuels this spacecraft? We saw two particle accelerators from orbit before we landed. Now tell us what you are doing with all the (whatever elementary particles you would have to jam together to get a bigger-than-nuclear amount of force)? Don't hold out on us, we just want to go home."

If they had the technology to even come here they couldn't care less.

Who gave you internet access ?

I doubt that refueling would be of much concern to them