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Dear Q & A: What difference does tail wind or head wind make on gas mileage? Lately I’ve been carefully measuring my mileage between fill-ups, mostly on trips of more than 50 miles, and I’ve noticed quite a difference even over the same routes. Can wind really make much of a difference? — S.D. Dear SD: Sure can. Look at it the way a pilot does. If flying into a steady headwind of 35 miles per hour at a cruising airspeed of 100 mph, the airplane will be going at a true speed (groundspeed) of only 65 mph. Fuel mileage is affected similarly. Since wind resistance is most vehicles’ greatest obstacle in attaining good fuel mileage, the higher the headwind, the worse your mileage. Conversely, a steady, high tailwind can boost mileage gratifyingly. Drivers who have onboard computers with real-time mpg readouts can vouch for the radically different mpg they get on the straight and level depending on whether they’re fighting headwinds or being pushed...
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