Yeah, but in that line we never get to hear how they express it out loud, whether they say point eight gees
(or point eight gee
) or point eight gravities
(or point eight gravity
). Saying "gravities" is also done [e.g. http://boards.straightdope.com/sdmb/...d.php?t=418638
, "Could people survive at two gravities?"].
Just two different ways of saying the same thing, one an abbreviation of the other. It's like a doctor saying "ccs" instead of "cubic centimeters" (or "milliliters," which are equivalent). So that strikes me as a trivial distinction.