The problem i have with drafting semi's, at least on the Garden State Parkway in New Jersey, is that semi drivers rarely ever follow speed limits, and rarely ever do they drive with constant load. They accelerate hard up upgrades and let off on down grades. They themselves drive very inefficiently, which in turn forces you, the drafter, to drive inefficient. Thus, the potential gains are not as great.
Draft semi's who cruise at a constant speed on flat highway works amazing, though.
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