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At 2 seconds distance there is no grit strike to speak of.
I see no benefit in getting any closer; turbulence increases close by and ruins the aerodynamic flow, nullifying any gain.
In my biking days I have felt the buffeting of the tail winds in the few instances I was that close by a truck. Usually when merging into a busy highway, the gaps don't get that big...
I can hear the occasional grit stone hit my car, but when that happens there is always someone very close by in the next lane.
It never happens when I'm just alone behind the semi and there's no car in the next lane.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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