No, a real automobile does not have constant acceleration. The acceleration of a real automobile can vary depending on a number of factors, such as the speed of the car, the terrain, and the driving conditions.
The data in the table shows that the Porsche 944 Turbo's acceleration is not constant. The car's velocity increases from 0 mph to 28 mph in the first 2 seconds, but it only increases from 70 mph to 78 mph in the last 2 seconds. This means that the car's acceleration is decreasing as it gets faster.
There are a number of reasons why a real automobile's acceleration is not constant. One reason is that the engine's power output is not constant. As the engine revs higher, it produces less power. Another reason is that the car's air resistance increases as it gets faster. This air resistance acts as a drag force on the car, which slows it down. Finally, the car's wheels can lose traction on the road if they are not properly inflated or if the road is wet or slippery. When this happens, the car's acceleration will be reduced.
Even though real automobiles do not have constant acceleration, it is often useful to model them as if they do. This is because it can make the math involved in calculating things like the car's stopping distance or fuel consumption much simpler.