The exact number of r-regular elements in finite exceptional groups

We calculate the precise number of r-regular elements in the finite exceptional groups. As a corollary we find that the proportion of r-regular elements is at least 3577/18432 and for all \epsilon>0, there are infinitely finite simple exceptional groups such that the proportion of r-regular elements is less than $3577\mathrm{/}18432+ϵ$ for some prime r.