I'm guessing they are measuring fuel efficiency as MPG, so a denser fuel has
better numbers just like the denser diesel fuel has a built in MPG gallon
advantage because it is heavier than relatively light gasoline.
--
Best Regards,
Mike

http://photoshow.comcast.net/mikenoel


"Eeyore" wrote in message
...


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