I spoke the guy at Reus as I passed through the other day, he has changed his pitch slightly since the Airport started charging for car parking. His current deal is : 15€ to collect your car from the Airport, first ten days parking free thereafter 50c per day, 15€ to deliver car back to Airport. I have his contact details if anyone needs them.

€3.00 a day sounds like good value,as long as you know who's driving your car and where too......

Parking at 3 euros per day away from Reus? Obviously in a secure compound? Who holds the keys? An easy way to rent out your car while you are on hols,it would not be the first time, it's already happened at Gatwick as well as parking your car in roads just out of town where its not too populated but vulnerable to vandalism or theft. I take it that this guy has in place the insurance to cover anything(or is he moonlighting?) that may happen whilst you have put the car in his care.
Advice?................Let the train take the strain! Train to Barcelona Sants, take the connection to the Airport, cost? 22 euros return at the most from Tortosa, must work out cheaper than paying the parking, and fly Easyjet, just got a flight for 24 euros single back to UK........AND, no parking fees or worry, is the car going to be there when I return?
      I rest my case,............hand baggage of course!

Enterprising chap !!!  Doesn't sound Spanish does he.  Don't know if that instills confidence or not ?

the german at sol mar is called "jorg" i have used him for 18 months since i had my car stolen at the airport.he has my car for months at a time as i only come over for holidays.he is very helpful and always on time to have my car waiting for me at the airport,tyre pressure checked,all the levels checked,cleaned inside and out and full of fuel if asked.he charges 15 euro to drop and 15 euro to pick up and the end of the holiday,the first 2 weeks its parked at his is free then it is under a euro,think it might be 50 cent a day after that.well worth it and very reliable.