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Your best bet is to do the grill block and make a partial belly pan for it to bridge the gap (if there is one) between the bumper and the front of the chassis (usually where the engine is mounted). That alone will give you a pretty good improvement on millage. When Car and Driver did it back in the 70's they attributed most of their millage gains to the air dam they made and the partial grill block. they were able to go from 14mpg to around 18mpg at 70mph. But that was also with a few other small changes as well.
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