"Ray" wrote in message
news:sl%Sd.15423$uc.3231@trnddc09...
I spilled a fairly large amount of a gasoline additive on the floor of my
car, and now I can hardly get in it.

The additive smells like a mix of oil and gasoline.

Does the odor ever go away on its own? Or is there something that I might
use to get it out?

Pull the carpet and the pad and throw in the trash. Order new from the
dealer and install yourself. Who knows, it may be cheaper than all the
cleaning that you're about to do, and, with better results.