Let $B$ be the number of cars with both features.

By the inclusion principle: $B$ can range from $0$ to $\min(25, 17) = 17$.

But we don't know the total number of cars, so we can't determine the exact count. The number must be at most 17 and at most 25, but could be $0$ if there's no overlap.

The answer is: no more than $17$.