If mpg was enough of a concern for me to put in the time and effort that went in to the OP’s study, I wouldn’t be driving a Jeep. ESS or not, Jeep and fuel economy are like oil and water. That being said, our 2019 jlur on 37’s is our most fuel efficient vehicle, averaging 17mpg. My 2017 rebel averages 14, although I drive it like the gas pedal is an on/off switch since it’s so much more fun than the work van. The 2007 E350 is the worst of the bunch, averaging 12 mpg. Of course with all the tools, ladder rack, and material it’s the heaviest and least aerodynamic. Our vehicles all serve a purpose that is far outside being mpg driven. If I were buying a commuter car to just get me from a to b it’s not hard to find double the efficiency of a wrangler. It would be interesting to see the difference ess makes on our etorque vehicles, but ours has been off for a year since the tazer went on. It certainly didn’t seem to make any difference when we used it, aside from the AC blowing hot air at stop lights.