How is this news? Yes, you need more energy to move a larger heavier object…Granted, the older engines might not be the most efficient but they weren’t that bad that you can compensate a weight increase of this magnitude!
"Light trucks" (in the US, at least) don't have to meet the same fuel economy standards as passenger automobiles, the latter of which includes SUVs. So you build a massive luxury crew cab with a tiny, essentially useless bed, and you can emit more pollution than if it had a permanent "cover" and connected the passenger cabin with the cargo area.
Also wrong. A big car doesn't have to be heavy. Especially in comparison with old cars. It's all about how you drive a car not what car.
That "study" is biased as fuck.