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Start with:
*Full grill block (winter), most of grill blocked (summer)
*Belly Pan (full if possible, at least do the engine bay)
*Windshield Wiper Block
*Smooth Hubcaps (if yours look like the picture)
I would block basically the whole grill in the summer. A hole the size of a large cell phone should be sufficient. When doing this, also duct the airflow so that it's forced through the radiator, not around it. Next do a belly pan at least as far as over the engine bay. When I did mine, it didn't take long and had a drastic impact on the amount of road noise observed. I also did a belly pan behind the rear axle since that was just a big open cavity. It looks like a windshield wiper block might be a good investment of time also.
My belly pans, grill block (only half the grill, no ducting), and windshield wiper block reduced my drag by ~12% and increased my FE by 6%.
Later on when I built a big 4 foot long KammBack, it reduced drag another 12% and increased FE by another 6%. I think if I had built a full boat tail, I could have been expecting MPG numbers in the 55-58mpg range during interstate driving (65-70 mph sustained).
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