Update:
Yesterday I ordered a Winter Grill Cover and Lower/Intercooler grill.
The winter cover will do well to improve underhood temperatures and front end aerodynamics. The intercooler grill is more for protection as it is porous but gives some blockage
I will be looking to get some cloro or something that will use the lower grill as a base to provide complete blockage.
Yesterday I went to get my tyres pumped up to 40psi (10% below side wall is what I like) and found the fronts were at 30psi and the rears were in the low 20's
I will not be able to enjoy the new mods though as I go on call on Friday for 14days. Then I use the work Tundra 5.7. Not good for the environment but, no personal fuel use is good fuel use