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That's why you physically connect the cars and then run them at full speed limit in the left or middle lanes. They can break off or add more but other cars maneuver around them. 20 cars and a tug would be about 360 feet which would be similar to 2 or 3 semis traveling together.
Getting twice the range on an electric car is good, but using none of it for a little bit of diesel is even better.
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