"nrp" wrote in message
oups.com...
It seemed as though the AOPA article ignored the proven success of
MoGas, but it did point out the very limited success of 100LL
alternatives. I wonder if there are any more high compression engines
running in test cells trying replacement fuels. It sounded like there
was only one.

GAMI has been running a Lycoming GTSIO-540 on a test stand using rot gut gas
using it's PRISM system without a burp, and hoping for an STC when they can
work out vibration tests.

http://www.gami.com/prism.html