haha i dont know a guy in my dad's office did it in one day but about the nav i also have a civic 9th gen and i found city's multimedia a bit faster than civic's like if touch the screen everything pops up quickly in civic it takes one or two second late well thats my opinion
I have only drove it 104km so not really sure about fuel avg but the acceleration is great plus one thing i noticed is that it doesnt hit the speedbreakers i live in malir cantt and yaha pay every 50ft theres a speed breaker and previously i owned a city model 2010 it would hit a few speed breakers so i took the car to those speed breakers and to my surprise it didnt hit a single one. i would recommend everyone to go for aspire be it manual or auto ya 1.5 ya 1.3 if you want to enjoy city go for aspire it gives you everything.