A question was asked a while back actually about three weeks ago in the French newsgroup about the proper way of intensifying 'fewer'.
The consensus seemed to be revolving around such idioms as 'far fewer ...', 'considerably fewer ...', 'a lot fewer', and 'much fewer' until someone brought up a quote with 'many fewer':
"We have much fewer people, many fewer people on food stamps now than we did previously", quote from
http://edition.cnn.com/TRANSCRIPTS/0008/27/le.00.html . The writer of that post wondered whether there was a sort of progression going on from 'much fewer people' to 'many fewer people'.
Being a timid creature, I refrained from offering any opinion, although 'many fewer ...' sounded funny to my admittedly foreign ears. I looked for advice in Swan's /Practical English Usage/, and it says that 'many fewer' can sometimes be found, and it doesn't label it as wrong.
I'm at a loss. What do you native speakers think?
Isabelle Cecchini