My lawn mower leaves a whole six inch patch in the middle of the cut!!! So between the wheels...it will cut eight inches on each side...WELL then there is a whole patch of grass not cut!!! I have tried everything. Moving side to side, mowing criss cross...mowing slow...mowing fast...using the self propelled...not using the self propelling...It's like getting a mohawk haircut!!! I just replaced the blade...nope! Still a mohawk! It is not tall grass...not heavy grass..it's grass. I even tried a new blade. Nothing has helped!