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Welcome to EM!
From my testing an upper grill block get me .78 mpg from the aerodynamic improvemt. The faster warm up times are harder to measure but it does make a noticeable difference.
You can also pm me and I can send you a template of my grill block.
If you do a bit of searching on matrix mods you will find I have done testing for almost all of my mods and have posted both the raw data and my conclusions.
I would also look at doing the pizza pan hub caps. I did it with alumin pans and a 5 bolt pattern on my winter tires and it looked faily sharp.
Also go look through our wiki, there are lots of good mod ideas and good data to show how much mpg gain each mod does.
Even with the 2zzfe engine in it you should be able to get about 45 mpg without a boat tail .
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