You may be right about our historic average being favourable over Leicester, but the fact is when Leicester dropped into league 1 briefly not so long ago their crowds held up extremely well, higher in fact than what we are getting now.
In 2001/2 their average attendance in the championship was just over 19000. Since then they've never had less than 20,000 on average per season and regularly bettered it in the championship before selling out year after year in the Premier League .
It isnt necessarily the case that having a CV postcode of 850,000 should guarantee 24k season tickets . The reality is that outside of Coventry many CV postcodes are not necessarily swarming with Coventry fans. They should be but they're not.