I used the Airtabs on a 2005 Titanium 5th wheel with great success so when I traded for an 2007 Damon Tuscany I installed the Airtabs again. Can't say the mileage is better but the ride is better when passing or being past by semi's. I recommend the Airtabs
John (BJ) Fletcher
One other thing, they do keep the back of the coach clean but only till you pass under an over pass or go thru a tunnel.
BJ