There's nothing self-evident about it :) Crude oil was going for $113/barrel in 2014 (which is likely around the time that Hertz made the decision to buy sedan

There's nothing self-evident about it :) Crude oil was going for $113/barrel in 2014 (which is likely around the time that Hertz made the decision to buy sedans) and then went down to less than half of that a year later. While the price has fluctuated since then, the prices have remained fairly low. Meanwhile, Americans like SUVs for reasons that I don't fully understand, but it's just a fact. And when gasoline is cheap, it doesn't cost that much more to buy one, so demand is high, and therefore resale prices go up (at least compared to sedans).