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I think Karsten is right that tailgating will improve the fuel consumption (and speed) of both vehicles.
Does a truck experience a decrease in fuel mileage if they are followed closely by a car that in turn experiences an increase in fuel mileage?
Or, at least does the truck slow down a bit?
In car racing they say two cars drafting can go faster than just one car. But what about the fuel consumption for leader?
I would say the truck uses more fuel, since someone is obviously helping the car to save gas and that costs the truck some fuel. True?
If yes, are the savings/losses equal?
If not, where does the energy to "pull" the following car come from?