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Contrary to the color codes in the simulation, you can use drafting to save fuel at longer distances than one car length... at approx. 30-40 ft. distance, I save around 0.5 l/100km with my setup which equals to about 10% fuel savings. Closer in, you may save more, but this cannot be sustained for longer periods of time safely.
Safety will always be an issue. Much depends on how you drive. Burger in one hand, soft drink in the other, cruise control on, foot on the dashboard: yes, you will have a hard time to brake in time. If your eyes, hands and feet are were they belong, your safe driving envelope will grow.
so long,
tinduck
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