The calculated distance (air line) between Tuam and An Muileann gCearr is approximately 62 miles respectively 100 kilometers.
By car or train, the actual journey to An Muileann gCearr is certainly longer, as only the direct route (as the crow flies) between Tuam and An Muileann gCearr has been calculated here.
Air line (approximately)
100 kilometers
54 nautical miles