Since we're talking tractors, the gas Cruze can't do nearly the same amount of work as the diesel version so the comparison is kind of dissimilar. You have mentioned that people don't need that power in a car. Are you suggesting they don't need it in a tractor? Face it. Gasoline engines can't stay in the torque curve when a load is applied as well as diesel engines. Its a fact. Until that gas engine is developed that can match the torque holding ability of a diesel, you'll never see the return of gas engines in modern tractors.
Personally, I hate diesel engines. My current tractor is gas. My cars are gas. One's a GDI. I love it. But facts are facts and you're beating a dead horse here. Gas engines in cars designed to move people from point A to point B can't be compared to tractors designed to do
hard work for long periods of time. Its two completely different tasks. While my IH2500b had a gas engine, and it could do serious work, it was only a power source for a hydraulic pump. It had to be run at near full throttle to provide the hydraulic pressure needed to turn the wheels and PTO effectively. While the diesel equivalent of the same tractor was close to the same power, it had better fuel economy and the diesel engine was simpler. Why didn't IH keep putting gas engines in tractors? Why are most tractors in the last 40-50 years diesel? Why are most (I think all) large trucks diesel? Why are train engines diesel? Ship engines? I can't think of any modern heavy equipment at all that uses gasoline for a fuel. There's a reason for that. Diesel works better in those applications because it stays in the torque curve better. Gas engines don't.