There are other standards that can put vehicles in different emissions categories. I believe the one that most crossover SUVs target is being considered “off road”, by having four wheel drive and meeting a few ground clearance specifications: https://www.ecfr.gov/current/title-49/part-523#p-523.5(b)
The goal of promoting these small SUVs instead of sedans is actually because they’re quite fuel efficient: being in the same category as much larger trucks, they pull up the average fuel economy and take the pressure off manufacturers to make their highly-profitable bigger SUVs more efficient.
The goal of promoting these small SUVs instead of sedans is actually because they’re quite fuel efficient: being in the same category as much larger trucks, they pull up the average fuel economy and take the pressure off manufacturers to make their highly-profitable bigger SUVs more efficient.