Hey everyone, I haven't posted in a long time, I used to have a 2010 Challenger SE 3.5, but recently upgraded to a 2015 RT 5.7 with the Super Drag Pack, 5000 miles, I have a couple of questions, 1st my gas mileage is around 13 miles to the gallon city, I do tend to jack rabbit start, its hard not to with this car, I thought with the 8 speed tranny I would get around 16 to the gallon??? Also, I knew the ride would be rougher with the sport suspension but it seem to really jar my spine sometimes, the weather has been bitter cold up here in Michigan so I'm not sure if it is because the shocks might be a little frozen, but last night I was changing lanes and accelerated, hit a bump in the road my rear tires literally came off the ground, kinda freaked me out!!! I am running with snow tires with 31 pounds of air so the tires aren't over inflated and i heard snow tires are softer then the stock tires. another thing, the rear end seems to make a thumping sound when hitting these bumps almost like the shocks are bottoming out, is this normal for these cars with the tight suspension?? Thanks , any help would be great!