I spent a few nights KGTU October 2016, and it was definitely GA friendly.
It's a bit of a hike to downtown Austin, but the Avgas price is less than KEDC. Uber was reasonable to the north side of Austin area, ~$25.
From the KGTU website - "A courtesy car available on a first-come, first-served basis. The tie-down fee structure has not changed: $5 per night with first night free and the second night free with a fuel purchase."