Happened to see this thread and wanted to check on the info provided in it. As an update (as I haven't seen a direct link anywhere and all but the last post was from before the season started) - the City of Sacramento established a website to help facilitate parking for events (most major events in the City, not just at the G1C):
http://www.cityofsacramento.org/public-works/parking-services
Click on the "Find and Reserve Event Parking" banner on that page:
and then select "Browse all Event Parking". That will take you to a list of all the upcoming events, including major concerts, Kings games, etc. Select your event (or, as I have done before for a very small event not listed, another event in the same time frame) and you will get something like this:
Just click on the lot/location you would like to park at (or check out) and you get a pop-up that looks like this:
Notice that while the event map with parking options generally shows the time as about 1 hour before to 1 hour after the event, the actual parking lot pop-up shows the hours covered by the parking pass. In this case, it is from 3.5 hours before the 6 pm game and runs to 7 hours after! Great deal for parking! Then just prepay using a very simple login system. If desired, it will keep a copy of your credit card information so when you log in again the information is still there for future use. They will email you a pdf of a parking pass with a bar code you can print and use. Scan the code as you enter and leave the lot. I haven't tried it, but you can likely just pull up the code on your phone and scan that instead. Easy-peasy.
I haven't used it, but there are also parking options not tied to specific events I think, you can nose around if this interests you.
I have found myself parking at the "Panda Scan" lot shown above - I feel it is important for me to use a City-owned lot to support the City's decision to help finance the arena. Only $11 per game, and easy access from Business 80 - just exit 10th Street and go north, the exit is right there on the right side of the road once you pass L Street. When you get out after the event, you can go a couple blocks west to 9th Street and it is a straight shot south back to Business 80. Frankly, while the traffic is a little jammed in the immediate area around G1C right after a game, getting in and out of the lot has never taken more than a couple cars in line - VERY fast entry and exit. I have parked at the parking structure just west of Macy's before a couple times for events and it takes MUCH longer to get in and out.