The two hottest stories of the week involve the making of the latest “Transformers” movie, where we discovered several potential General Motors concept cars and maybe even some future NASCAR prototypes. Our conversation about cloth upholstery in the Buick LaCrosse gathered the most comments this week and was our third most popular post. Toyota’s potential exoneration from the sticky-pedal issue came in fourth, and our minivan editorial rounds out the top five. Check out our most-read stories below.