The EPA mileage estimate for the 2013 Infiniti G-Sedan is 19 mpg in the city, 27 mpg on the highway.
Found this on infiniti's website. http://www.infinitihelp.com/diy/gsedan/projects/incabin_micro_filter_replacement.htm
There's a DIY video posted at http://www.infinitihelp.com/diy/gsedan/engine_transimission.htm
follow my DIY video here: http://www.infinitihelp.com/diy/gsedan/projects/infiniti_g35_rear_brakes_replacement_procedure.htm I have a lot more of these DIY videos for the G35 here: http://g35driver.com/forums/showthread.php?t=183421
There's a video at http://www.infinitihelp.com/diy/gsedan/engine_transimission.htm
I have two videos for replacing air filters on the G35. There is an intake air filter (for the engine) and there is a microfilter for the in-cabin air (for passengers). Depending on which you need to know about refer to the below videos: Intake Air Filter Replacement Video: http://www.infinitihelp.com/diy/gsedan/projects/engine_air_filter_replacement_procedure_video.htm Microfilter Replacement Video: http://www.infinitihelp.com/diy/gsedan/projects/incabin_micro_filter_replacemente_procedure_video.htm
You can go on this website they have lots of information and videos on DIY. this is the link for the stereo replacement : http://www.infinitihelp.com/diy/gsedan/projects/infiniti_g35_radio_replacement_procedure.htm