The West Philly team says they're out:
All Good Things
So that would mean there are only two teams left in mainstream: Edison2 with their 2 Very Light Cars powered by E85; and Illuminati with the battery-only "7."
It looks like it will be very tough for anyone to get to the 100 mpg goal in Mainstream.
Alternative should be doable, especially for a vehicle like the E-tracer, which is really a faired motorcycle. They were showing over 300 MPGe on the telemetry during the highway test. Aptera was also above 100 (if they're still in the competition), as was the Li-Ion Wave, FVT Evaro, and ZAP Alias.