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One of the things I missed about owning a diesel was the ability to vent and top off to the tippy top with no worries allowing for a 14 gallon tank in my VW TDI to hold almost 15 gallons. This also allowed for the most precise measurements of mpg since one can see the fuel right there at the cap and one sees it each time at the same spot, knowing the possible filling error has been eliminated.
However, diesel fuel, like most liquids can and will expand when heated up, i.e like parking out in the sun as the earth warms up during the day, so the only worry regarding a diesel and topping up, as long as one tops up carefully while watching the fuel level at the pump so as not to inadvertently spill it on the pavement, would be if you vented and topped up and then didn't drive far enough on a cool morning before parking to burn off a little bit of fuel. In that scenario, some fuel could spill out around the cap or overflow system in the vehicle, but that would be a rare scenario for most drivers.
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zeusstx 
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