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that's amazing i never heard that, you always hear advertisements and the auto communities stating a dirty air filter is bad for your mpg.
Also i have a good feeling my butterfly valve of the throttle body is dirty and shows all the specific symptoms of it (immediate surge of rpm after cold start ups, and goes back to regular idle rpm shorty after, and a medium rough idle in traffic and Park). Do you think that would effect mpg?
I have a engine coolant temp gauge, so yes i can monitor how the blocking works. My quesiton with grille blocking is is it still effective if I put it directly behind the actual grille and infront of the radiator etc? In other words I want it to be subtle and not directly on the outside of the car. Again aesthetics on this car is more important to me than a few % of aero. I would think any kind of block is better than nothing.
Thanks for the reply. I am starting to see you're posts everywhere.
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