Here's the route I took a few years ago with mileage, fuel and toil costs.
 
This is the route that I have taken a couple of times.
Euro Tunnel to Condado
12:30 Arrive, take A16 to Boulogne
12:50  A16, Take ticket,
13:25 Abbevile Toll €7.30 Take A28 to Rouen
14:38 At Rouen continue on A28 to La Mans then Tours  Toll €26
 Full up car €53.11
 At tours take A10 Poitiers
16:48 Leave A10 on N10 to Angouleme Toll €11.20
 Join A10 to Bordeaux
 Merege in A63
 Toll at Bayonne €3.2
 Toll Biarritz €2.2
 Toll Saint-Jean-de-luz €0.7
22:00 Arrive ETAP Saint-Jean-de-luz
 http://www.accorhotels.com/gb/hotel-6560-etap-hotel-etap-hotel-ciboure-st-jean-luz/index.shtml
08:30  Leave take A63 
 Toll at Spanish Border €1.5
 Join A8
 Take A15 to Pamplona  Toll €1.9
 Fill Car €44
 AT Pamplona AP15 to Zaragoza  Toll€3.25 and €3.55
 At Zaragoza take A23 to Valencia
 A7 towards Albacete
 Take A35 then A31 to Elche
 Rejoin A7 to Murcia
 Take RM2 
 Take RM23 to Mazarron 
18:00 Exit 7 Arrive CDA
 Total 1160 Miles Toll €57.25
 Condado to Euro Tunnel 
08:00  leave
12:15  Zaragoza
14:09 Pamplona
21:00 Arrive ETAP Tours 
 http://www.accorhotels.com/gb/hotel-5023-etap-hotel-tours-centre/index.shtml
08:00 Leave Tours
12:25 Arrive EuroTunnel
 
Phil