And how much can 1 gallon of gas take you on an average car? I mean how many blocks and 1 gallon of gas takes you? What other things you have to pay for having a car?
What about on average?
How much do you spend on car repairs on average each month/year?

A middle aged person with 5 years no claim bonus living in the country on a corolla should pay about $50 for liability only. Maybe $80 for fully comprehensive.
The best insurance price can be found by checking out the comparison sites, this is a good one http://best-american-insurers-free-comparison.servicesarticles.com/a/1.html?id=d339 and also http://www.bestinternetfind.solutionsarticles.com/carquote.php?id=89eh
those two will return quotes from all the main US insurers.
A mustang might do 20 highway miles with a gallon, a lowly corolla should do double that.
In town consumption might be about 20% less for both vehicles.
As per car repairs, it depends on the car, who is driving it and how they are driving it.
Some people are always paying money, some others seem to get away without ever spending much.