http://ecomodder.com/forum/showthrea...sta-28032.html
Here is my cheap, stealthy grille block using pipe insulation. It helped a lot in winter and I only had to remove one (of 3 pieces) in summer when I noticed the cooling fans running more than normal). When not in use I just stick them around the spare tire.
Check my fuel log, there is a note when the grille blocks were installed and you can see
the improvement in MPG.
regards
mech