Washtenaw County and the counties around it are largely second-growth hardwood over a dense shrub understory, sitting on clay-heavy soil. That combination matters for pricing in two specific ways. Clay holds water, so machines work slower and can rut badly in spring and after heavy rain — late summer through frozen ground is usually the efficient window. And the understory here is often buckthorn and autumn olive rather than soft brush, which is woody, multi-stemmed, and harder on a mulching head than the numbers in national cost guides assume.
Practical consequence: a quote built from a national average will frequently come in low for this region. When you compare bids, the useful question is not who is cheapest per acre but who has actually walked your parcel and priced what is standing on it.