Will the Diesel be Dead?

Recently bought a new-to-me 2017 model car. BIG thing was about fuel economy and MPG. Rated for 24 MPG or greater, with all kinds of gadgets and stuff to provide that from a 4 cyl engine. My 2000 model Chevy minivan V6 consistently got 30+ mpg on the highway, and average overall about 26 MPG from the time it was purchased up till it was traded with over 135K miles. So what is the new tech good for?? And the van didn't quit every time we stopped at a stoplight.