Do you recommend pure gas in your mercedes.

Pure gas or no ethanol fuel is hard to find in the US. E-10 should be just fine in my Mercedes.

I'm NOT a Gasoline Expert but you can purchase "pure gas" easily all over the U.S. here are a few examples...http://pure-gas.org/extensions/map.html

There is no "pure gas" where I live and the map says 2 locations offer it.

I am assuming you mean non-ethanol gas.??? yes, your MB will run on non-ethanol gas. But the cost difference just isn't worth it. Run any good quality Mid-Grade and your car will be happy. Try to stick with Tier 1 gas if at all possible. Your car does not need premium fuel - even though MB says it does. If you drop down to Regular grade - it will still run just fine, but you may see a drop in performance and mileage. In theory - if it does not "ping", you could run Regular. MB and other makers know that many of their users are NOT using Premium fuel and despite the labels on the fuel tank. They have been designed to run on a lesser grade.