Yate tradionally was a Gas area without a doubt.
However, when the town expanded (mostly during the 70s + 80s) families relocated from all over Bristol and thankfully tipped the balance which is now firmly in City's favour.
Having gone through secondry school (early 90's) my age group was always majority of City fans - but the older generations more Gas.
When my age group hit the pub scene in the mid 90's and on to the 00's you could see a big change with City fanbase getting larger and the Gas reducing.
I think the worrying thing for the Gas now is the lack of new fans coming through for them.
It is evident that for the youngsters, City shirts are a far more common site than Gas shirts - there is a definate lack of blue shirts being worn in an around Yate nowadays - ???