looking for a new motor, currently got a mk5 1.3 fiesta. want something faster and better on mpg.

i love the mk6 zetec s.
Probably looking at the tdci one as do 50 miles a day.

heard mixed views on the tdci, good or really slow.

Whats your views of the tdci and the petrol fiesta zetec s? (05 to 08 plate i think)