You don't need fields to grow your own food.
Little Space? Grow Vegetables inside
>>>process my own fuel, too.
Actually, if you have space inthe backyard, you can. Still permits are available to private citizens to process ethanol. You can buy an older car and use ethanol. It works from grass clippings and garden debri.
Check this out:
http://www.aerogrow.com/store_seedkits/step1a.php?clickname=What%20Can%20I%20Grow%20(Menu)