spain is easy to drive...just tough to park in the older sections of the major cities, e.g., Sevilla, but this is true for much of Europe.
speaking of diesel, be careful to select the right product when you fill your tank. some years ago, i stopped at a gas station and filled my rental with the cheapest product, which at that time was labelled "gasolina." i figured, why pay extra for super? well after a few miles, the car started to sputter and eventually died. fortunately was able to restart and limp into another station, whereupon i learned that "gasolina" is actually diesel, and that the unleaded gas is labelled "super." mechanic was kind enough to drain the tank (only $5) - but it cost quite a bit @ $5/gallon to re-fill the tank with the correct gas.