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I did a 75% block in an effort to get a hotter IAT, managed 20*f over ambient. With the grille block in place & hotter intake air I still ran a 20.2 mpg with ambient air temps about the same for both runs (no aba). My truck is real consistent at 20.2 mpg for some reason. I can say though that around town throttle response is noticeably better with the grille bock in place & warmer IATs.
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