I was curious to see if anyone knew the difference in curb weights between the MS6 Sport and Grand Touring package? Everything I've found online suggests that they share the same weight, but from my experience, generally cars equipped with a moonroof weigh in at about 70 lbs over their hardtop counterparts. I figured the addition of a moonroof, leather, additional power accessories ect should make the Grand Tourning model just a tad heavier than the Sport. I only ask because I test drove both a GT & a Sport model before I bought my Sport, me and my girlfriend both agreed my Sport felt just a little quicker. I guessed it had to do with curb weight, and was wondering if anyone knows what the difference is?