This is a good site for costing your expenditure on tolls . Also good for route planning and fuel cost.
autoroutes.fr/voyage/itineraires.php?lng=1
Its in French though!
Instructions for those who dont know French
Localité de départ (Departure point) Eg Calais
Localité d’arrivée (Arrivale point) eg Murcia
Distances en (Choose Miles or KMS)
Véhicules : (Select ) Poids Lourds +12T Remorque ou Articulé Diesel
Choose 3 Essieux (3 axles) next to it
Carburant= Diesel
Coût au litre : 0.81 Euros (enter the Euro amount here); YOU CAN PLACE THE AMOUNT IN WHAT CURRENCY YOU USE THOUGH
Indemnités perçues au km ou miles ( LEAVE BLANK) , this is asking what your perceivd costs may be in Kms or Miles
Cols d’altitude (Hills) Eviter (avoid) Autoriser (allow) slect which ojne you want
When done click on Valider! You will get a screen totalling your toll costs, diesel cost, amount of fuel used.
Eg
De : Calais (62, France)
A : Murcia (España)
Itinéraire : Express Véhicule : Poids lourd +12t remorque ou articulé
3 essieux
Distance : 1968.6 km Voies express : 1962.3 km
Durée (1) : 21H26
Carburant : 601.83 € (743 l)
Péages (2) : ESP : 73.66 EUR
FRA : 182.50 EUR