If you think that Bioamber's technology is dead or doesn't exist you will be amazed what they are doing secretly with Visolis and the DOE, and is connected to Lanzatech , making jet fuels from feedstocks, https://biomassmagazine.com/articles/19581/lanzajet-marks-milestone-on-its-freedom-pines-fuels-construction/, Visolis is connected to this and Mitsui, new plant in Georgia 2023 Visolis mentions high density fuels, https://www.biofuelsdigest.com/bdigest/2017/11/04/synthetic-biology-enable-manufacturing-the-digests-2017-multi-slide-guide-to-visolis/