i can lie as easily as i can tell the truth; actually, telling a lie is easier for me, as it is a retelling of a story you have prepared, as opposed to all the on-the-spot thought that occurs while telling the truth.
this doesn't mean that i like to lie, i tell the truth as often as possible, but i have mastered the art of the 'white lie' and 'bending the truth', both mainly as a method of appearing less weird then i am, telling small lies and excuses for my behaviour and increaded perception, so i'm not seen as a freak (by more narrow-minded people)
also, becouse my bodylanguage appears bland and neutral accross the board, there is almost no way of discerning whether i lie or not, except if you happen ot know the true story (telltale signs like nervusness and avoiding eye-contact are also typical of me in any social situation, so those methods fail)
i think the idea that aspies cannot lie is due to a few things.
firstly, i dont like lieing, i always feel bad for days afterwards (if it's a big one); brutally honest is my opinion of choice.
secondly, my bodylanguage doesn't change if i lie, tell the truth, tell a joke or strongly tate my words.
thirdly, i am able to recall the lies i told for years, far beyond any NT would, allowing me to stick to my story.
if these three points are as common among other aspies as i think they are, then those might explain the misconception