Carjet

These are both the same company but prices sometimes vary ~ check them both out.

Whilst the prices are very good, they do charge you a high rate for a full tank of fuel & request that you return the car with an empty tank.
However, if your rental is for three days or less, you have the option of returning the car full & get a refund.

Centauro

Again, this company charges for a full tank but you have the option of returning the car full regardless of length of hire.
Take this into account when comparing prices.
[We recently hired a small car (Ford Fusion) & were initially charged €53 for a full tank.]