There is a belt and helmet obligation as well as a total ban on alcohol. Even the first time its very expensive, at the third time you will be send to jail for 6 months.
in towns 50 km/h * outside villages 90 km/h * on highways 110 km/h
Turkey has a very dense network of service stations. Generally, the gas stations are also rest places, there is almost in every station a supermarket, also almost a clean toilet and often a Restaurant. Fuel will be put in by an who usually knows which fuel has to be filled. Avoid paying in Euro, they always give a very poor rate. It is possible that a fuel station runs out of fuel, so don´t wait until the last drop....