Anyone have experience using an air deflector/wing when towing?

I was considering adding one to the cap to help "push" air over the trailers nose. The manufacturers "claim" 10-20% better fuel economy and I'd like to know real world experience from those that use them.

http://www.wingmaster.com/home.php

 

don't know anything about them....just saw them on a few fords around here.

 

When we all where using gassers to pull our fivers, guys with the wing picked up about 3 miles per gallon which was just about doubling their miles per gallon. I didn't have one, I couldn't have gotten into my garage, I was a one man show back then.

yepper they work,,,,,,,,,,,

 

i picked up around 10% better fuel economy (hand calc.) with my replacement K&N Filter - it's a cheaper alternative.

 

iv seen people use them and a friend had one on his chevy...he likes it. i dont know bout fuel mileage though.

 

I have one that I bought off of ebay, nice unit, but to be honest the only difference that I have found is that I get less bugs on my 5er. I dont think I noticed any extra fuel mileage.

Kevin