It's rare that an automaker revises a fuel economy rating down, but that's what General Motors did with the 2015 Chevrolet Corvette.
A new eight-speed automatic transmission and 2.41 rear axle ratio give the new Stingray a nearly 4 percent bump in fuel economy over the 2014 car.
In GM's fuel economy testing, the car returned 29.42 mpg on the highway.
To reach a company goal of having the first sports car to accelerate from 0 to 60 mph in 3.7 seconds and get 30 mpg highway, all GM had to do was pump a few more pounds of air pressure into the tires.
But Tadge Juechter, Corvette chief engineer, nixed that idea because it would have given the car a harsh ride.
"We could have raised the tire pressure and then recommended in the owner's manual that it be reduced for a smoother ride," he said. "Some companies play that game. We won't."
So, GM rounded the Corvette's highway fuel economy down to an even 29 mpg -- best ever for a Corvette.
Meanwhile, Juechter said engineers are working on hitting 30 for the 2016 model.
"We'll be back next year, and we'll get to the 30," Juechter said last week at a Corvette media event.