I don't deal with it, the Mr does. He gets cheap rates, I have no idea if it is because he knows people or does a deal but I hasn't exceeded £140 max yet. We've rented in November and March. We are in Djerba though, further south and not in places such as Hammamet so I don't know whether that has any influence on prices. Also for petrol we don't use the stations. You'd be amazed how much 10 friggin Dinars gets you compared to what we pay here for fuel!