civic is the better car but city is a brand new car.....u might get surprises from an old better civic but u'll surely have none from a brand new city...plus the fuel consumption is a big factor....the money in which u'll be maintaining n driving an old civic on CNG will still be more than wat u'll be spending on the new city on PETROL...rest the choice is urs. I agree the new city isnt as comfortable or grande but still will surely feel much much better with a better set of tires like yoko Db or mich energy savers.
2 months back i was faced with the same choice....an untouched oriel on petrol 32k driven isb no silver 05 model asking 1250 last of last and a new city which i got later in 1310....im happy with the city for the reason i can drive it on petrol in the same money which wuda been spent on CNG in the other car.