The curvature of the earth is not significant enough to cause a car to touch the ground in the middle. The earth has a radius of approximately 6,371 kilometers (3,959 miles), which means that over short distances, the curvature of the earth is negligible. In fact, over a distance of 1 mile, the curvature of the earth causes a drop of only about 8 inches.

Therefore, no matter how long a car is, it would not touch the ground in the middle due to the curvature of the earth. Other factors such as the car's suspension, weight distribution, and tire pressure could cause it to sag or appear lower in the middle, but this would not be due to the curvature of the earth.
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