I think you have to let people know any mods you've made to the car in an effort to cover yourself from a liability standpoint (not to mention dealing with post-sale questions that may arise). While the mods you are making are most likely aero-mods to improve MPG...imagine a buyer has an accident with the car he bought from you and the insurance company rules his insurance policy null due to a modded vehicle (that may or may have not caused the accident...it's not a stretch for this scenario to play out).
Anytime there is money (and/or liability) involved...always cover your back side. I'm sure it's probably a fine line between making a profit on the car and disclosure to the buyer...but it's not worth a few hundred bucks to risk it (IMO).
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