The GLI and 3 doesnt vary by much, but the 6 does. I am also looking to see what people get in the "real world" not what the EPA shows. Engine speed and vehicle speed have a lot to do with gas mileage. I don't necessarily shift at 3k rpm's or drive 65 on the freeway like the Mazda suggests. That being said, the GLI also has a 6 speed where the others have 5, as well as the gearing ratios are all different.