Ok, My mileage is better in Sport mode than in ECO so I am not sure what you are getting at here. With my driving style, I just can't use ECO mode. In ECO mode my foot is always on the floor trying to get it moving. In Sport it just goes. Gas peddle response is the big difference I like and the higher RPM at 40mph keeping it closer to its power curve. Now the wife could drive in ECO mode and never notice any difference.The difference in gas spending is a lot from sport to eco. Would be good to fix it.