So this is like our own Big Mac Index??

An icecream (a cone with 3 flavours) costs E 1,50 (No Euro on my keyboard...).
About the cheapest haircut you can get costs E 15,-
As for a doctor's visit I'm not absolutely sure, but it's around E 17,-
Gas is E 1,15 a litre (if I understand correctly what you mean by gas... I don't know how much a gallon is, hence the litre thing)