I HAVE 04.5 3500 LIVE IN CA MPG IS ONLY AROUND14 A LOT OF YOU SAY YOU GET UP AROUND 20 TO 24 AND HAVE MORE HP? HOW DO YOU DO IT ? I JUST NEED TO HAVE ALITTLE MORE POWER AND A LOT BETTER MPG CAN YOU REALY GET 24 MPG EMPTY???? IN A FULL SIZE TRUCK MY 4CYL TOY TRUCK GETS THAT? I WILL TAKE INFO YOU HAVE THANKS

 

Smarty + air in + air out + tire Pressure=great milage! That's in a nut shell! Oh yeah keep it around 65mph!