“You like Mark Twain?” asks a character midway through Tyler Nelson and Michael Schwartz’s road film. The person saying this is a man who is, coincidentally, named Tyler, a swamp rat played by Shia LaBeouf so beautifully backwoods-scuzzy that you can practically smell the country funk coming off of him. The woman he’s addressing is Eleanor, a city-dweller who’s found herself in a middle-of-nowhere service station and in his company. The question is rhetorical. Whether or not she’s a fan of the literary genius, the film they’re both in is most definitely in love with the author’s notions of adventure, the allure of perpetual motion and Americana. There are worse inspirations.