Mark
I dont mean to be picky but 80% + 65% = 145%, but i think I no what you mean.
For me I would say I used to convert about 33%, but this year with a slightly bigger ad I've pushed that up to about 65%. Always quoted over the phone.
The problem with the YP is that its a lottery, this year your ad could be in a good position & next year it might get lost & consequently you would get less calls.
Dave