The protagonist

As far as we know, the protagonist in 'Destroy All Cars' is James Hoff, a 17 year old high school student, who lives with his mother, sister, and father somewhere in Oregon.
We also know he hates 'consumer Americans' (and their cars) who drive huge cars with high fuel consumption; in his eyes the 'typical' American, who buys everyday something, even if it's just some useless rubbish, needs to drive, 'cause he does not want/like to walk.
James seems to have problems with his family, or at least with his father; he tells us how his father left the family for some time, but came back later, which he highly disagrees with. The main reason for this is how he got closer to his mother, while his father was gone; but when his father returned, his mother gave all her attention to his father, and ignored James.
We also get to know that James already had a girlfriend; Sadie Kinnel, who he already had breaked up with, when we start to read the novel. At this point, we get a short list with reasons James has Problems (which eventually lead to the end of the relationship) with Sadie.
In his essays, both School and personal, he complains about 'consumer Americans' in a highly enthusiastic way, which his english teacher seems not to approve, considering the grades James get for his essays.

So much for now, sorry for grammer mistakes >.>