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Originally Posted by 5inYSO
I usually fill no more than 1/2 tank, to save on hauling my fuel around.
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If you do a lot of city or stop and go driving, it could be noticeable and measurable.
On the highway, it doesn't make much difference.
In combined driving, it'll get lost in tank-2-tank fluctuations.
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Is this really a measurable fuel savings?
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Measuring it will be the hardest part.
It's got to help, as lower weight will always help.
It takes more energy to accelerate a heavier car, and its rolling resistance is higher.
Even in P&G situations, as you can't fully get back the energy that was put into the car.
Weight may seem to help the glide, but the energy had to go in first.
Same with gravity-extended coasting, you had to get the extra weight up the hill first.
People will do a lot of work to get rid of weight - like stripping the interior - carrying less gas is an easy way, though not everyone has 20 gallons to start with.
If you have a fuel station on a good point along your route, the extra stop won't make much of a difference.
If you have to drive around to get fuel, you might lose what you gained.