I've seen redline used for racing/high performance engines. It's suppose to be one of those fully sythetic base stock oils like Amsoil or Mobil 1 synthetic. Haven't really heard anything about them increasing FE. The one thing I will note is that any of the racing oils out there really shouldn't be used in a daily driver that gets it's oil changed every 3k miles or more. Race oils don't have the detergents or anti-oxidizers that regular synthetic motor oil has. This is because race engines are always broken down and put back together. Everytime this happens they change the oil so detergents and anti-oxidizers aren't really needed. I think redline sells a non-race version of their oil but I'd have to double check on that.
Theres the link and you can check out full line. Yes they have oils suitable for street use and they increase mileage.
Carefull when comparing 'fully synthetic' vs '100% synthetic' oils. They aren't the same. (Fully is not 100%). Also mobil1 has changed their formula over the years and downgraded base stocks (without dropping price).