I have heard a few hotels near IAH let their guests leave their vehicles at the hotel parking lot for a few days for free but I wonder if any hotels near the airport in Austin do that too. Thanks!
The Microtel at Red River and 71 will let you park up to 6 days if you spend the night. I had a friend who called the Holiday Inn next door to the airport and I think got quite a few more days without staying a night for around 60 dollars.
The round Hilton will let you park and provides free shuttle service. I don't know if the parking is free or not, I just enjoy the service and ease of flying from AUS when I do that.
Comfort Inn provides free shuttle service & lets you park free for one week. When you get back, just call the front desk and they'll have a shuttle there to pick you up in 15-20 minutes.
Saved us $50 on what we would have paid at the Parking Spot