Travel Advice for Brits going to Maranello for 60th Celebrations

Please could you guys comment on these three different suggested routes from Eurotunnel Calais to Lake Orta (Pettenasco) our stop over point for the first night.

Can't understand how there can be such differences in the routes and distance/time to travel.

Apologies for only posting links to routes - I have never managed to take capture the print screen

Michelin - Longest at 1166km

E15 - A26 - A4 - A35 - E25 - E35 - E62


MULTIMAP - 1028km

E15 - E17 - E54 - E21 - E60 - E23 - E25 - E62


AA - Shortest at 850 km

N157 - E60 - A6 - A39 - n83 - N5 - E62

Doesn't let you post links to site for some reason ???

 

OK Ignore this AA route as that had picked up on a place called Saint Calais !!

True route coming out at 1014 km.

However another completely different route.

A26 - A4 - A5 - A3 - A39 - N5 - E62