Last summer, I tried to maximize my MPG on a short road trip. I drove from Redlands, CA to Palm Desert on I10...approx 60 miles. I put the Cat in ECO mode and drove at the speed limit. Drop in elevation from start to finish was about 1500 feet. I achieved a 28.5MPG. Yesterday, I did the same route and wanted to see if the HC could do 30MPG. In ECO mode and I really was light on the pedal. Got a 30.5 MPG. Of course, on the way home...driving normal...I got around 18 MPG.