Civic Rebirth has softer suspension as compared to Reborn and better stability on road.
Eco mode in rebirth make the fuel average better by reducing throttle response.
My Friend has City aspire 1.5 prosmatec 2018, average he gets 16-17 on highway. but i don't like the city drive.
And the average i get (Civic 2014 Prosmatec hardtop) on highway with 80-90km/h speed is around 19.5-21km/l shown on i-Mid display panel. and on motorway at 120km/h speed 18.5 i get with manual cruising (mtlb paon ko aik jga set kr k acceleration zero krna - means change in speed should be zero).
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And as far as maintenance is concerned, its not much costly if you take care of your car regularly.
My service log:
Oil change cost = around 5000/- (including oil, air filter, oil filter)
Oil change after 5000-5500km.
Oil grade = 5w-30 fully synthetic Honda Oil
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and tuning after 20,000km. which includes plug cleaning and cleaning of throttle. which cost 2000 total if catalytic converter is cleaned.
Optional : catalytic converter cleaning (if clogged above 50%)
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and as far as major issues concerned, Alhamdulillah i haven't faced any one them yet. so no idea on it.
Tip:
I would recommend you guys that buy endoscopic camera and always bring it with you while going for tuning. because these mechanics put screw driver in it to scratch and check the Catalytic converter's cleanliness (damaging it) or they try to see with camera light which don't show a single bit of honey comb inside catalytic converter and says " gadi khuli ty hai. krwa lawo. average changi ho jaye di ty pick v changi ho jaye di". and we people say " ok g kr den ".
No doubt it will make huge difference only if it is chocked or clogged above 50%.
the endoscopic camera is mentioned will help you see thoroughly how much catalytic converter is clogged.
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endoscopic camera work only with those mobile who have OTG connectivity enabled. or you can connect it with laptop. ( A professional way to check catalytic converter).