This would be hard to guess remotely. Among other factors you would need to state the year of the G and other pertinent details (tire size, antennas, etc). In general the only sensible way to do this is to empty the target G of everything including fuel, over inflate the tires, pop up the sunroof and measure. If your driveway goes down and into the garage there are other factors to consider too.What is the actual height of a stock G? From the website, it says 76" overall. But then there is another reference to 77.8".
My garage is limited in height.
Is there anything you can do to lower a G an inch or two that doesn't void the warranty or involve keeping sacks of sand in the trunk? Getting a hefty girlfriend is out of the question since the fuel efficiency is already abominable.
Thanks.