Is roughly 40-50% attribution enough to make decisions?

Yes, and it is a deliberate choice.

A stop is attributed only when the vehicle's GPS trace, dwell time, and proximity align with a known POI, rather than inflating coverage with uncertain matches. The unattributed remainder is not a data gap; it represents stops at private facilities, construction sites, and staging areas that do not correspond to any named business. Highway-adjacent sites like truck stops and travel centers sit at the upper end of the range. Because the same rules apply everywhere, location-to-location and brand-to-brand comparisons stay valid. Petroleum and gas operators have confirmed this level supports multi-million-dollar site decisions.