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I was just asked this question and have no real answer.

"Does it affect gas mileage if I refill the tank when 1/4 full or when almost empty" :shrug:

Diesel vehicle.
 

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I was just asked this question and have no real answer.

"Does it affect gas mileage if I refill the tank when 1/4 full or when almost empty" :shrug:

Diesel vehicle.
Yes, but probably not in a way that will be noticeable.

If he has a 40 gallon tank, 1/4 tank is 10 gallons. Diesel weighs about 7lbs per gallon. So waiting until near empty to refuel allows him to carry up to 70lbs less load, which should let him accelerate to speed using slightly less fuel.
 
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