FD3 fuel consumption
10-12kmpl City (might do up to 14 depending on nature of traffic)
14-16kmpl outstation
17-18 highways
If you are getting an FD3, get one that has YOM after 2009. 2008 models are known for IMA issues and hybrid battery drain.
I have a 2011 FD3 and loving it. Performance is of course not par with FD1/FD2/FD4 but it's a good choice if you want the handling of a Civic but cannot afford 6-8kmpl fuel consumption.
I have driven around 5000kms since I bought the car and my average fuel consumption is 13.7. This includes commuting to work daily in heavy Colombo traffic, and travelling between Kandy-Colombo twice a week.
In, Kandy-Colombo trips I usually get around 16kmpl. Sometimes more.
I do not baby the car and drive like a typical "hybrid driver" either.
For me it works well because I drive around 2000km per month.