Mike Noel wrote:

The synthetic fuel is 15 to 20 percent more fuel-efficient

Pardon ? How exactly is one hydrocarbon fuel "more efficient" than another ?
Engines that are optimised to run on 100LL are AFAIK unlikely to run any
'better' on anything else unless 're-tuned' and I'd imagine that has associated
certification issues. Sounds like marketing twaddle to me !

Do you have a link to this article ?

Graham