Next month we are travelling (hopefully) via eurotunnel to North Italy. We won't be stopping in France, Belgium, Luxemburg or Netherlands as we want to avoid having to quarantine in the UK on the way back. From Calais to just inside Germany is around 300 miles (I think). Obviously if driven as I normally drive it that could be considerably less! I think I should be OK. What do people normally get out of a full tank?