The stretch of highway linking Patras to Corinth is above all the one that really does not deserve to be paid! Most of the route is in a single lane, with an emergency lane on which slow vehicles are forced to travel, without divider between the two directions of travel.
Patras – Corinth
The deviation I propose allows you to get, in a perfectly legal way, onto the so-called highway about 23 km from Patras saving the € 7.90 which is the current rate for motorhomes.
It just takes a little attention, especially for those coming from the north, via ferry or Rio bridge, to take the old road to Athens. In the map below I marked the starting point at the beginning of the old road [N 38.301371, E 21.796885] I suggest you to set the navigator so that it takes you to that point and from there, you will just have to follow the road for 22 km, until you see a sign pointing to the right for the entrance to the highway, only that there are no toll booths! 😉
Corinth – Patras
For the stretch Corinth to Patras, things are just as simple. From Corinth, follow the signs to Patras, pass the junction to Tripoli and take exit to the right following the signs for Archea Korinthos. When you reach the top of the ramp, turn right and follow the road up to Kiato. There follow the signs that send you to the highway for Patras and you will not encounter any toll booth. To make thing easier it is best to set the navigator on the beginning of deviation [N 37.916779, E 22.88451] and then just follow the road.