I do think you have nailed it alexpops.
So this is the real inconvenient truth. If you think man caused co2 (anthropocentric) at .25% of all greenhouse gases will be a factor in climate change then you have been duped. (its politics) and the idea of making rural America pay for this hoax is about as ignorant as one wishes to be. So the idea of certain people who claim they are in the know about whats at stake here, are also dependent on a government run their livelihood. It's an economical hijacking of America (and for that matter Canada as well)
So just to get back on the subject of cost/fuel economy. We are paying more for less. I have a tier 4 2013 Kioti. If I had opted for the new California emission tractor (new ones being made in 2013) with complete electronic controlled combustion with the re burner, it would have cost me just shy of $2,000.00 more. If i run the 20% bio-fuel (which i only did by mistake once) it starts hard and just didn't seem to have the power. This was without first knowing i had bought It...
and the guy with the fuel economy chart; about ten factors have gone into your chart if indeed on the level and not modeled like they have skewered our climate change data. First the wt. of the cars have been reduced with plastic, some aluminum and other cheaply fabricated alloys. Which makes them less safe and if you have ever had a leaky head gasket from a warped aluminum head, you get the picture. Second, cars are smaller have smaller engines and more dynamic. Third the use of low viscosity synthetic oils (which cost much more) help the engines run smoother.....also fuel injection which has been the single most contributing factor to your "metropolitan" data. Most trucks nowadays are street cars with a bed thats too small to carry a big load. Not really trucks in other words.
(4) computer controlled everything may make it stay tuned better but if one item fails then you vehicle doesn't run...how do you like to be dependent on someone else to get you where you need to go? Some of us old folks are pretty good at keeping our equipment running good (maintenance and tuning)because we don't live in the suburbs or even close to a dealer. Cost of living is in our budget and we can't afford to subsidize the high cost of cleaner air and climate change when we contribute such a small amount to this "noble" but politically skewered propaganda.