Advection - Default advection is inherited from earlier versions of FumeFX (Fume FX 2.0 and lower). While it is a good all-purpose advection, it generates visible dissipation.
Another advection you can choose is Advanced (fields) advection that will result in lower dissipation. This advection operates on fire, smoke and temperature fields, while velocities are still advected using Default advection.
Advanced (fields and vels) advection operates on all fields and velocities as well. This type of advection is excellent for slow moving fluids while highly divergent and fast moving fields might result in artifacts in the form of lines or crosses (see image below). Keep in mind that this advection is very good in preserving small scale detail, so the vorticity value can be kept really low (around 0.1).
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