I have the Continental Cross Contact LX 20's, with Eco Plus. Have not noticed a marked improvement in mileage, as is claimed. I MIGHT get 1 mpg better...maybe. I would have to drive them for a few more months, to get a good average. But, I usually get 21-22 mpg on long, straight, flat county roads (55 mph). I get 18.5-19 on the interstate (65+). And, 13-13.5 in town. I'll watch my numbers, and post back in a month, or so. ...just put them on a week ago.