I have not noticed any change in gas mileage or power since going duals. The only problem I have is at about 75 MPH i get a slight driveline vibration because of the shorter shaft and angle. that is the only downside I have noticed. Have only had them in about 3 months. I will have to do another gas mileage test to see if it changed anything. Powerwise it feels the same though
![I Dunno... :dunno:](https://board.marlincrawler.com/Smileys/marlin/dunno.gif)