I know more about Helsinki than Tampere, but here's my take:
Food - Your employer gives your lunch vouchers (Lounasseteli, current value 7,90) which gets you a decent lunch. As for eating out, good places are relatively inexpensive by international standards, the not so good ones relatively expensive. As a general rule, a place that accepts Plussakortti or any other loyalty card is overpriced and to be avoived if possible. For groceries, depends totally on what you eat, 300 to 600 a month would be typical I guess.
Drinks - Rule of thumb is that any wine below 10 euros a bottle is not very good, which is the same in dollars in States I've been told. Lager costs less than euro a bottle, and for reasons nobody quite understands, soft drinks cost about 1.50 a bottle. In a pub/club, roughly three to five euros a drink depending on the establishment.
Taxes - Use the tax percentage calculator at
http://www.vero.fi/default.asp?language ... RO_ENGLISH
For example, out of 50k a year you pay 33% in taxes and alike payments. You may also eligeable for the furriner expert tax which is flat 25% or something like that, I don't really know about it.
Car - I don't need one, don't have one, don't really know the costs.
Housing - In tampere I'd guess 500+ a month to rent an appartment. Buying, sorry I don't have a clue about Tampere market. 100k for a good apartment? Interest rates are low, about 3% with bank margin. They are going to go up at some point, but I just don't see them going that high with Euro. (Markka was a very volatile small currency, which lead to double-digit rates at times.) Then you ofcourse you have to think about where dollar-euro rate is going...