“could someone tell this oldtimer the difference between a station wagon and a crossover?”
Zero differene other than that th EPA doesn’t like station wagons, but the crossover seems to have confused them.
The very first cross over was the AMC eagle wagon 4WD. The most popular crossover is the subaru outback. A crossover is simply a semi off road version of a station wagon with more ground clearance and 4wheel drive.