So for the grill block i read that a lot of people like to do the block behind the grill to maintain a stock look but i didn't think that there would be much of a difference with that grill placement so i decided to get the drill out and start drilling holes and zip tying my way to more earth friendly efficiency
I was also lucky enough to find black Coroplast which made me happy because the white would just look bad but this kinda looks OEM if you are 20-30+ feet away.
I have not done any testing but during the 15 miles I've driven i haven't noticed a difference at all in temps or mpg, but that was all in city. I feel like i may see around a 1 mpg difference from what i have read, being optimistic maybe 2-3. Just by looks this seems like it is a lot more aerodynamic than the OEM number scooping up all that air.
The other mods i have planned are a full underbelly pan, haven't decided between Coroplast or aluminum yet. And i have been installing the Rostra cruise control system for about a month now having all kinds of issues that are getting sought out thanks to Kartronix on eBay.
Here is a link to his eBay store and i would really recommend that you go through him if you are buying a cruise control unit.
kartronix on eBay