I take it that you will be taking the route throgh Rouen past the Cow roundabout.
go as normal on to the A13, stay on the road for about 10 miles as i recall it is sign posted for Le Mans (there is a service area about 8.5 miles) you will then reach the new junction for the A28. There are no fuel station on the road for 128km but i think there is one when you get to Alencon.
It really is as simple as that i had all the maps and routes with me and did not need to look at them.
New road is nice, it goes down to one lane twice, i think there are cameras on one of them, only for a short distance.
Andy
P.S it takes a lot of time out of the journey, we used to do Calais to LM in about 4hrs 45 to 5.00 hrs now down to 3hrs 30 without stopping and cruising at 80mph