just over 2,200 miles
The M26 is 9.9 mi (15.9 km).
There are various routes from Dublin to Athlone. The best is to go by the M4 motorway to Kinnegad and from there to Athlone by the M6 motorway. Going that way it is about 77 miles. That would be about 125 kilometres.
The M42 motorway is a major road in England. The motorway is 55 miles in length and spans Bromsgrove in Worcestershire to Ashby-de-la-Zouch in Leicestershire.
25 km
100 miles taking A483 NEWTON from Welshpool to M4, and then the M4 MOTORWAY to Swansea.
117 miles approx
Length: 162.9 Miles.
Barnsley to the fishing port of Grimsby on the east coast is 78 miles by Motorway routes. Or 58 miles as the crow flies.
PART URBAN PART MOTORWAY 55 MPG
M8, which actually starts about 10 miles west of Glasgow.
I get about 42 miles to a UK gallon - mixed driving with 50% motorway driving at speeds I should not document.