Yes they're worth it. They don't actually ADD horsepower, but they get your rpm's into the powerband quicker. So you will really feel the acceleration.
Highway mileage isn't too bad for me. I'm running 2500 rpms at 75 mph. 2000 rpms at 60 mph. So I average about 20 mpg on a tank. Depends on how often you put your foot to the floor!!
Highway mileage isn't too bad for me. I'm running 2500 rpms at 75 mph. 2000 rpms at 60 mph. So I average about 20 mpg on a tank. Depends on how often you put your foot to the floor!!