I hope I am asking this question in the right place. We just bought a 2014 Passat TDI SEL and while we were looking at either the SEL or SE version. It seemed that they listed better fuel economy for the SE version?? The only real difference that I am aware of is the tires? Now that we have the car home, in the owners manual lists 3 tire options for the 2.0 215/60r16, 215/55r17 or 235/45r18(which we have) Looking at tire specs, from the 18 down, they drop about 1/2in in width each size. Does that width make a huge difference on mileage? And does anyone have any experience with the 16's on there car? Pics of 16's? I would also assume that the 16's would ride the best, then the 17's and 18's. Thanks.