I had a customer tell me that I was cutting too low on his propety at 3" so I offered 3.5" inches and told him I do have one other customer that gets a south facing slope at 3.5" to helpe ase the droughty conditions and full exposure. He said he has always mowed at 4", I said I could try that and see how it looks but I have never heard of lawns being cut above 3.5" the only place for 4" grass in my opinion is a golf course rough. However, I can understand as long as I can still get the grass to stand up and cut properly 4" will be fine, but I couldn't promise how it would look. Anyone else ever have anyone tell them to cut at 4"???