Help and frying at Mondeokauf

Hello people, I think about buying a Mondeo combi. Who can tell me how high the consumption is? I drive a lot of short distances in flowing traffic. About 12000 km a year, once with the WoWa in vacation. How is the type class? Is the price ok? I set the three that interest me times: No.1: GlX EZ:08.97 km 85600 1.8 l, 116 hp, petrol black metallic 2 previous owner accident free Price 7900 Euro Nr 2: Ghia EZ: 05.97 km127850 2.0 l ,131 hp, petrol blue metallic 2 previous owner I don’t know yet price 7100 Euro No.3: Trent E.Z. 01.99 km:116,500 1,8 l, 90 PS Diesel red 2 Previous owner accident-free I don’t know yet new great customer service made (dental belts etc), Peis 7900 Euro All with very good equipment, they don’t all give themselves a good optical impression. How is the diesel in the cover to the petrol engines? What does the diesel cost on taxes? How are the trailer loads? All are from the same Ford dealer. I can’t drive it yet,the Hä ndler makes vacation. Thank you for all who can help me Uwe