I haven't tried the Redline but I have had great results and 2mpg increase with the Lucas Upper Cylinder Lubricant with Injector Cleaners and Fuel Conditioners. It also treats 100 gallons of Gasoline or Diesel Fuel. And as a bonus it is environmentally friendly. Great stuff. Much better than the Techron in my opinion.
Its about seven dollars for a quart bottle.
1989 420SEL 105575 miles
1990 Chevrolet E-Cab C-1500
1989 Olds Toranado Trofeo'