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I vote for a full grill block. I was just at the Milwaukee Hybrid Group meet talking with Prius guru Wayne Mitchell (fire engineer on Priuschat) who knows a ridiculous amount about the different Prius' and HSD. The basic consensus of the discussion was for winter do a full grill block unless you are taking a prolonged highway trip, then just pull a tiny part out (we talked pipe foam since that is the most common block type). In summer you might need to open it up a little more, but I think he said he just runs all summer with one pipe foam piece removed. Warm up is critical for good mileage with a HSD vehicle. I have a 7 mile commute and most of my mods are focused on heating the car up and it has definitely helped.
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