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John deere
Peterbilt
A John Deere tractor is the best tractor to do farm work with. They always have the most weight limit, and can pull just about anything. They always have good reviews and last a lifetime.
A sub compact utility tractor is probably best for your small farm. You can find it here on the John Deere website: http://www.deere.com/en_US/ProductCatalog/FR/category/FR_TRACTORS.html
The gas mileage of a farm tractor depends on the model, the year, the condition, and the land driven on. There is no set gas mileage to be expected from a farm tractor.
It would depend on farm size. Any farm should have a tractor for day to day operations of the farm. But size matters when choosing the correct type of tractor.
There are many different types of farm tractors out there. You can look in the manual that came with the farm tractor to see how it works and how to maintain it.
It may not be the best way to go to find a used farm tractor. They are good for used cars but not really farm equipment. Depending on where you live though you may have luck finding one there.
They just call it a tractor.
U Can Use Tractor tires to run A farm Tractor
The best tractor for your needs will depend on what all you are going to be doing with it. A tractor is expensive. A site like Mother Earth News has great articles on self sustainable farming and equipment. Here is a link for one of their articles on small tractors: http://www.motherearthnews.com/Sustainable-Farming/1981-03-01/Small-Farm-Tractors.aspx
The farm tractor has made farming more efficient and reduced the time it takes to do things. For some farmers it reduces the number of farm hands needed to do the work. By reducing time of labor, how much ground can be covered and reducing the number of employees many farmers can make more money or at least not lose as much money.