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1. Is it advantageous mileage wise to drive near the retaining wall on the freeway or in a more open spot?
2. Is it advantageous to drive in the low pressure zone on the side of a truck - mileage wise. If you don't know what I mean, the next time you're on the freeway and you're passing a semi truck, notice that as you come up the side of the semi truck there's a tendency for your vehicle to be pulled in towards the truck - and as you get to the front of the truck, the air being pushed out of the way of the truck will tend to push your car away from the truck.
The lighter the car you drive will make this more apparent, as will you and the truck traveling at higher speeds.
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