Europe now has over 50 countries, with different currencies and prices. There would have been less countries in 1957, but there would still have been different currencies and prices. Also, prices would have fluctuated during 1957. So for all of these reasons it is not possible to answer your question with a single answer.
Gas: $.24
first of all they dont have a gallon of gas in europe!!! but if they did they would be about 4.72$.
In 1957, the average price per gallon of regular leadedgas was $.31 cents.
In 1957 gas averaged around .30 per gallon.
The average gas price in 1957 was $.24
it changed in 1957! :)
1957.
around $3,00 to 3,300.
The cost of mailing a standard letter within Australia in 1957 was 4d (four pence).
Europe
Many houses cost different prices in 1957. Some houses could cost as little as a few hundred dollars for a nice home.
If your talking petroleum and diesel then Petrol averages 1.38 per liter Diesel averages 1.41 per liter