If fuel expense is a reason than go for a new shaoe prius hybrid but only a fresh import low millege and high grade car for that you should contact shazaib aka @sharabi bhai
Parts
Parts are avaible easiky here in Rawalpindi but expensive but since your other choice is honda so price difference in the parts would not huge since honda parts are expensive too
Economy
Prius if all well would give you atleast 20kmpl and civic max could give 11-12kmpl
Shape
New shape prius is quit stylo and has an awesome interior with quit good legroom
Civic in my prospective has an abnormal shape and interior no doubt good design but seems more compact to me as compared to previous gen
Comfort .features ans build quality
Definitely Prius takes lead
An advice
If going for prius go for jdm import not uk import as there is bit diffeence between both models and parts of uk cars are bit difficult to find out
Regarding cng im not in favour of cng when you could opt for a hybrid
My vote is for hybrid
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