GAMI's G1000UL is currently the only approved unleaded avgas, and Jon Sisk wanted to test it on his RV-14. See his full interview with Larry Anglisano to get the results and a great perspective on issues in the experimental and certified aircraft arena around this issue.
Read the full report in Aviation Consumer:
https://www.audioauthority.com/downloads/literature/2023_Aviation_Consumer_G100UL_Flight_Trial.pdf
