I guess you should change of brand: I don't know in Europe of any similar model built today that has not a considerable better millage then the similar 13 year old model.
Manufacturers have been concentrating hard on that point and the improvements on that area have been big. In many countries tax on cars depend on CO2 emission and that depends of the car consumption. That's why they have worked on that a lot: less tax means a car cheaper then the rival that pays more taxes because it wastes more fuel.
Wow, European cars. What a great example! Don't get me started about this wonder of contemporary European engineering!
Your European car manufacturer has made great efforts to reduce the CO2 emissions on its contemporary design. And made tons of money by selling the cars based on the tax advantages you mention.
Improvements have, indeed, been big. Problem is the progress was in finding even more pernicious ways for cheating on emissions tests. They have been concentrating hard on hiding that the 'modern clean diesel' spews out more than 40 times the allowed maximum of NOx. So one dude driving in his euro-chic car generates more nitrous oxides than a 40 ton truck in this country, after being told that his 'clean diesel' is actually eco-friendly. And all this from the ultra-ecological Germans, that don't miss an opportunity to lecture the world about pollution. Turns out they care sh*t about the environment and whether they are literally killing people, as long as they can make a buck.
And when they were caught in their deceit, for more than a year they condescendingly told the regulators that they were wrong. "You don't know what you are talking about, we know better, we are the largest car company in Europe, no, the world!" But you have to give it to them, they always had great commercials. At last year's Superbowl their motto was "Truth in engineering." You could not make that up!
They are fouling the air that we, and our children have to breath. I hope they get the largest fine allowable under the law and are made to buy back all the sickening cars that they sold with their fraudulent methods. Oh, wait, they have a plan for that too: Volkswagen actually suggested itself to buy back the illegal cars in Germany (which are even MORE polluting than those in the US because European pollution rules are much less rigorous). But not to shred them, or to fix them: instead, the plan is to sell them to Turkey, or Africa (or maybe Portugal?), any place where regulations are even less strict than in Germany. Nevermind they will foul the air there and literally kill people. It is good enough for the people there, they are just untermenschen.
European contemporary technology, my foot. See, you got me started.