stingray 0-60

I have 2015 Corvette Stingray 2LT Convertible 8 Speed Automatic It has been a wonderful car...I drive it very gently and I have 15,800 miles and average gas milage is 23 miles per gallon Over the last 4 weeks I am noticing the following When I accelerate heavily ..i.e. try to get 0 -60 in 4...

Car & Driver is estimating the Stingray to have the following performance figures: 0-60 MPH - 3.9 seconds 1/4 Mile - 12.3 seconds @ 118 mph Top Speed - 190mpg Roadholding 1.00 g Braking - 70-0 mph - 155 feet