The information posted in this thread indicates that acquiring more parking means there is more actual real estate, not just more parking spaces squeezed into the same lot.
But in answer to your question, there is a point where narrowing the aisles becomes problematic.
NJ code sets the size for Parking lot spaces to be 9 feet x 18 feet, and there to be a 24 foot aisle between rows, when cars are parked at a 90 degree angle to the aisle. That gives each tailgate group 12 feet behind the parking space for tailgating. Standard tailgate canopies are 10 feet in size. So if you set up the parking lots according to code, each tail gate group has 1 foot additional space front and back of their canopy. As you reduce the size of the aisle, you reduce the amount of space each group has to tailgate. Once the size of the aisle is less than 20 feet, you don't have enough room for groups to set up their canopies.
Last year, Rutgers painted orange lines on the grass, to show the parking attendants where to park the cars in each row. If those lines are less than 60 feet apart, then the parking lots are not up to code. If those lines are less than 56 feet apart, there is not enough room for tailgating.
That also means to gain another row of cars, you'll have to reduce the aisles by more than 1 foot. The yellow lot is the longest lot, at about 800 feet. That means about 13 rows of cars (each row containing 2 cars front to back plus an aisle) with 60 feet between rows. To even add a half row (just one car plus tailgate space) of feet, you would need to cut more than 2 feet off each of the existing aisles.
Good info - never really thought about how they laid things out. And holy crap, I had never looked up the average length of an American vehicle. My Civic is a svelte 14' or so, but many SUVs are 18', so yeah, I can see why they have 36' per double row of cars (would've thought it was smaller), which, plus 24' of aisle space, is your 60'. Also, not sure the codes apply to temporary parking.
Of course, being an engineer, I now have to contemplate redesigning for optimum space utilization, lol. I never really looked, but I wonder if they start the first row with 12' of space (on the stadium side of the car, which is only used by that first row of cars), then do a double row of cars, then 24' of space, then a double row and so on until the last double row, where they'd then need to add on another 12' of space at the end for the last row of cars (again, not shared space).
Or do they start with a single row of cars up against some barrier or very close to the road and then have 24' of space shared between that single row and the first row of the first double row and so on until the end, which would be a single row of cars sharing the last 24' aisle with the last double row of cars.
Guess it doesn't really matter, but in either case you'd have to add on 12' of space and 18' of car length (30' total) to add a single row of cars with tailgate space. However, if there is 800' of space and 13 rows takes 780' at 60' per double row, including aisle space, then you have 20' extra, so all you need to add another single row of cars (18') and tailgate space (12') is 10 more feet. You can certainly squeeze 10 more feet out of 13 rows, by cutting the aisles down by less than a foot per aisle (10/13th of a foot, actually). Instead of having 4' between canopies, you'd have 3.3' roughly, which I think people could live with.
In the yellow lot, I'd guess less than half of tailgates use canopies, so I think they could get by with squeezing down a little less than 1' per aisle, leaving 23'. I know we'd have no problem with that, since we almost never use a canopy (I hate them, unless it's pouring rain). Of course, a few folks wouldn't be happy when they're canopy to canopy and only have 3'3" of aisle space between the canopies - and the tailgate SWAT teams might not be happy either but f them, lol.
Fun with numbers (pun intended)...