Added this to the project library.
About your early on-road MPG results: A-B-A testing of undertrays isn't really practical. I managed to do A-B testing of my full undertray, and measured a ~2% change (see
http://ecomodder.com/forum/showthrea...9.html#post873 ). Apples/oranges, though - every vehicle is different underneath.
As long as you're not increasing frontal area (doesn't look like it), you can be sure this helps.