V70I BJ200 2.5 D consumption and control?

Hello, I’m thinking about adding a 2000 he v70 I have a 2.5 D in choose with 140 ps (is yes the 2.5 tdi machine of vw) I was told you come with a tank filling over 1000 km it would mean the consumption is below 7 liters with a 70 liter tank sounds very little but is it also credible? and still what the red plakete so euro 2 there are but so many different tax rates for eur02 and diesel can tell me how much control I have to pay for the e further has surprised me the “strange” equipment he has climate but no air conditioning semi-leather foglights and 4 ephs and no board computer is it a zero outfitter or was there only funny with the special accessories accessed? thank you greetings