Hey guys...I have some key info I think is important for those blocking their grill. I recently converted from my old style of block (one piece of insulation for the top grill and one for the bottom) to blocking each individual slat for a nicer appearance. I drove today from my home to St. Louis. Temps were around 42F and the terrain is hilly..steep in areas but nothing dramatic by Ozarks standards. This is all interstate with a70mph speed limit...and that's what I had the CC set at. Previously I've driven this in similar conditions with grill blocking and temps for MG2 and the ICE were fine. Today, however, I got a little concerned. I actually witnessed MG2 temps climb slowly during the drive up to 114F sustained and ICE temps up to 204F spikes, but sustained closer to 197F. I think the individual slat blocking gives a much more complete obstruction to air flow...great thing for short, low ICE used (aka city) trips, not so great with high speed hill climbing continuous ICE trips. If temps had been closer to 50F without ability to monitor I'm seriously concerned I could have been in the danger zone for the temps. I stopped for gas with the intention of removing a block from one lower slat but actually forgot. When pulling out of the parking lot I remembered and stopped, backed up a few feet (25' max)...saw MG2 spike to 152F briefly!!! That's,by far, the highest I've ever seen it. I pulled the middle insulation strip for the lower slats and took off. MG2 temp quickly dropped and was down to 120 by the time I was off the exit and within a mile was below 110. From that point on ICE temps ranged b/w 182F and188F(trending lower), MG2 was in the 70s and 80s the rest of the trip. Actually those are cooler than I would have liked, but I didn't want to stop again. And I didn't want to risk higher temps. So, if you have your grill completely blocked with the individual slat techniqueand do NOT have a way to monitor temps be very very careful on highway/high speed/high demand driving conditions esp. if OAT is over40F...I used to say 50F was safe, but I would not reconsider under slightly more extreme conditions.