Find out instantly whether it's worth filling up with ethanol (alcohol) or gasoline. You enter the price per liter of each fuel at your gas station and the calculator applies the 70% rule: if the ethanol price divided by the gasoline price is below 0.70, ethanol is worth it; otherwise, gasoline is the better choice. You can also enter each fuel's efficiency (km/l) for an even more precise cost-per-kilometer calculation. No sign-up and no personal data collected.