No, it wasn't a mistake.....it will help. It's just that they'll never be 30 plus MPG beasts, no matter what some people claim. Simply not gonna happen.
Um...I never said anything about 30 mpg...although I think it may be possible 30mpg driving VERY conservativley on the highway only...no way do I think it can achieve an OVERALL 30mpg...mine has the aerodynamics of a major kitchen appliance