In my brain, mathematically, "four times fewer" is nonsensical. What would one time fewer mean? Four times fewer would be better phrased, for me, as "one fourth of".

A bit OT, am I the only one that grinds my teeth when 'fewer' and 'less' and 'under' are synonymized? "Less calories" ~ aaaargh! "Under 300 calories" ~ grrrrr! I know that common usage, by definition, isn't incorrect, but . . . .

(less fat ~ no problem)