Other Ideas:
Lowering springs
lower air dam on front bumper
partial grill block
And this one might work for the Tahoe...pull your air filter, and put tape over part of the filter. I have a 5.7L LT1 Caprice, when there was a mouse nest in the air box it slowed the car down considerable IE you can't expend more gas if you can't get the air into the cylinders.
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