Swapped our 2 week old 90D for a brand new 75D loaner and immediately noticed the steering felt looser, in spite of both being set to "sport". Bouncing down country roads, the car just feels looser and less precise, with more body roll in the corners. Both are on 19's at 45 psi. This makes me wonder if the 90, perhaps due to battery weight, includes stiffer springs? Both are 2016 facelift models and the loaner has more recent vin. It also has more road/wind noise, but thinking the driver door is just out of adjustment. Aside from the battery, are there any other known differences? Or is all of this just evidence of the hit-or-miss quality issues some have been talking about? If so, glad we got lucky!