This is my general plan: I am going to spend from May 10th to the end of August driving through Europe. I will rent a car through Peugeot during this time for around 3200 USD. I will be driving alone, and do not plan on visiting very many big cities. I think this is a better option for me (compared to trains/buses/airlines) because I LOVE driving and will be able to visit smaller cities more easily. I also won't have to worry about carry on liquid restrictions and where I will store my belongings for these months.
I've been living in Florence since the start of the year and based on that I've budgeted 10 euro per day for food. Its more than I'm spending now but I would rather save more than I need. I've budgeted 10 euro per day for attractions/entertainment with the thought that I will not being going to museums every single day and I do not drink. I'm more into nature-y sight seeing which is usually free. I've budgeted 15 euro per day for accommodation. I plan to use couch surfing some days, stay in hostels or use AirBNB if I am able to find inexpensive parking on other days.
I plotted my route on google maps and used the average price of diesel in Europe to budget for fuel. I rounded up and plan to spend around 1000 euro.
I mainly want to know if anyone has done something like this and how it turned out for them. I also have no idea how I could calculate how much to budget for tolls and other misc expenses. Are there any glaring problems with this plan that I haven't thought of? I should also say that I do not think doing this will save me very much money, I just want to be prepared and know how much to save. And I do not plan on sleeping in the car. That would be like a very LAST resort. I only added this because every post I've read in forums is people asking if its legal to sleep in their cars in Europe.
Sorry this got so long, and thanks for any advice!