Hi folks!
 

I just found this site today while researching car body undertrays for stone chip protection, now I'm starting to think about how much fuel it could save as well. This looks like a very informative site. I am also interested in warm air feeds, as my car mpg drops down from 30 urban in the summer to 17 in the winter (cold winters).

I am definitely up for saving some fuel, it's not getting any cheaper!

Welcome to the forum. There is more than enough information here to make your car burn 40% less fuel if needed.

Welcome to the site. What Vekke says is entirely true, some even attain quite a bit more.